After reviewing the implementation of av_freep(void* arg) in the FFmpeg documentation, I have some questions. Specifically, can its code be simplified to the following form?

FFmpeg Implementation:

void av_freep(void* arg)
{
    void* val;

    memcpy(&val, arg, sizeof(val));
    memcpy(arg, &(void*){ NULL }, sizeof(val));
    av_free(val);
}

my version:

void av_freep(void* arg)
{
    free(*arg);
    *arg = NULL;
}