Array of strings memory reallocation in C

I have a project to do and I need to reallocate the memory for the array. I tried many times, but I have found just one version that works.

void resize(int* size, char*** arr)
{
    *size *= 2;
    *arr = realloc(*arr, sizeof(char*) * *size);
    nulltest(*arr);    // This checks if the allocation was successful
}

resize(&size, &arr);

This function doubles the capacity of the array, but I think it’s done too complicated, so I want to ask you guys, if this can be simplified or not. I’m open to new solutions too.

>Solution :

1. int is not the good type for sizes. Use the correct one size_t
2. Try to avoid side effects (ie modifying the objects passed by reference) without special need.
3. Your code is potentially leaking memory. If realloc failes you loose the reference to the previously allocated memory. The integer referenced by size is also changed without the need.

I would implement it this way:

char **resize(char **arr, size_t newsize)
{
    return realloc(arr, size * sizeof(*arr));
}

And the caller function should check for the errors.

But what is the point of defining this function? This one only returns the return value of realloc.