为什么我的变量没有初始化？

我将代码简化为最简单的代码来隔离问题，我发现了问题所在，但无法解决。实际上，我什至不知道是否有问题。

我有一个旨在初始化未初始化变量并重新初始化已初始化变量的函数。我的问题是我声明的变量似乎已初始化。

这是剩下的代码：

/**
  * This software defines the type TabDyn and gives the tools to manipulate it
  * 
  * TabDyn is conceptually an array of integers. The first element is the size while the others are the members of the array.
  *
  * Here are the function provided to manipulate TabDyn :
  *     td_clear(TabDyn* td) : Create the TabDyn object if non existant and initialize it to an empty one. If it exists, it empties it.
  *
  */

#include <stdio.h>
#include <stdlib.h>

// TabDyn[0] := size
// tabDyn[i] := i^th element of the array, first index being 1 (i>1)
typedef int* TabDyn;

/**
  * param - TabDyn* td_ptr : address of a declared int
  * void : initialize {td_ptr} to an empty array (size=0, no member)
  */
void td_clear(TabDyn* td_ptr)
{
    //this is the size of each member of TabDyn and thus the size of an empty TabDyn
    size_t TabDynByteCount = sizeof(int); 

    //We must free initialized TabDyn variables
    if(td_ptr && *td_ptr) 
    {
        printf("INITIALIZED!\n"); //#TOREMOVE#
        free(*td_ptr);  
    }

    //Create TabDyn object of size = 0 and give it to param
    *td_ptr = calloc(1, TabDynByteCount);
}

/**
  * Contains various test of the TabDyn function to ensure a correct behaviour by testing it at runtime with Valgrind
  */
int main()
{
    //* TEST decl-init-free #VALID:v0.04#
    printf("\n--- TEST OF td_clear BATCH 1 ---\n");
    printf("Declaring TabDyn variable\n");
    TabDyn tabTestAllocate;
    printf("Initialising TabDyn variable\n");
    td_clear(&tabTestAllocate);
    printf("Freeing now useless variables\n");
    free(tabTestAllocate);
    //*/
    //* TEST decl-init-init-free
    printf("\n--- TEST OF td_clear BATCH 2 ---\n");
    printf("Declaring TabDyn variable\n");
    TabDyn tabTestAllocate2;
    printf("Initialising TabDyn variable\n");
    td_clear(&tabTestAllocate2);
    printf("Re-initialising TabDyn variable\n");
    td_clear(&tabTestAllocate2); // It is not a duplicate
    printf("Freeing now useless variables\n");
    free(tabTestAllocate2);
    //*/
}

这就是Valgrind所说的：

--- TEST OF td_clear BATCH 1 ---
Declaring TabDyn variable
Initialising TabDyn variable
==10875== Conditional jump or move depends on uninitialised value(s)
==10875==    at 0x400654: td_clear (in /home/adrien/Documents/c/examen)
==10875==    by 0x4006CD: main (in /home/adrien/Documents/c/examen)
==10875== 
INITIALIZED!
==10875== Conditional jump or move depends on uninitialised value(s)
==10875==    at 0x4C2CDE1: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==10875==    by 0x40066E: td_clear (in /home/adrien/Documents/c/examen)
==10875==    by 0x4006CD: main (in /home/adrien/Documents/c/examen)
==10875== 
==10875== Invalid free() / delete / delete[] / realloc()
==10875==    at 0x4C2CE2B: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==10875==    by 0x40066E: td_clear (in /home/adrien/Documents/c/examen)
==10875==    by 0x4006CD: main (in /home/adrien/Documents/c/examen)
==10875==  Address 0x400540 is in the Text segment of /home/adrien/Documents/c/examen
==10875==    at 0x400540: _start (in /home/adrien/Documents/c/examen)
==10875== 
Freeing now useless variables

--- TEST OF td_clear BATCH 2 ---
Declaring TabDyn variable
Initialising TabDyn variable
==10875== Conditional jump or move depends on uninitialised value(s)
==10875==    at 0x400654: td_clear (in /home/adrien/Documents/c/examen)
==10875==    by 0x40070D: main (in /home/adrien/Documents/c/examen)
==10875== 
INITIALIZED!
==10875== Conditional jump or move depends on uninitialised value(s)
==10875==    at 0x4C2CDE1: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==10875==    by 0x40066E: td_clear (in /home/adrien/Documents/c/examen)
==10875==    by 0x40070D: main (in /home/adrien/Documents/c/examen)
==10875== 
==10875== Invalid free() / delete / delete[] / realloc()
==10875==    at 0x4C2CE2B: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==10875==    by 0x40066E: td_clear (in /home/adrien/Documents/c/examen)
==10875==    by 0x40070D: main (in /home/adrien/Documents/c/examen)
==10875==  Address 0xffefffe70 is on thread 1's stack
==10875== 
Re-initialising TabDyn variable
INITIALIZED!
Freeing now useless variables
==10875== 
==10875== HEAP SUMMARY:
==10875==     in use at exit: 0 bytes in 0 blocks
==10875==   total heap usage: 3 allocs, 5 frees, 12 bytes allocated
==10875== 
==10875== All heap blocks were freed -- no leaks are possible
==10875== 
==10875== For counts of detected and suppressed errors, rerun with: -v
==10875== Use --track-origins=yes to see where uninitialised values come from
==10875== ERROR SUMMARY: 6 errors from 6 contexts (suppressed: 0 from 0)

但是，如果我将变量显式初始化为NULL，就不会再有任何问题了：

 TabDyn tabTestAllocate = NULL;
 TabDyn tabTestAllocate2 = NULL;

我的变量不应该初始化为NULL吗？还是我的if语句未测试我认为测试的内容？