Sorry for the provocative title, but I’m too emotional these days.

This code:

#include 
#include 

struct tmp
{
  int x, y, z;
};

int main()
{
  struct tmp* m_result_original=NULL;
  struct tmp* m_result_my_version=NULL;

  // m_result_original=do_something_version_1();
  // m_result_my_version=do_something_version_2();

  if (memcmp(m_result_original, m_result_my_version, sizeof(struct tmp)!=0))
    {
      printf ("Error - test failed!n");
    };
};

There is an unnoticed typo. in memcmp().
I wrote here:

  if (memcmp(m_result_original, m_result_my_version, sizeof(struct tmp)!=0))

But must be (note closing brackets at the end):

  if (memcmp(m_result_original, m_result_my_version, sizeof(struct tmp))!=0)

Yes, this is a problem of weak static typing of pure C.
Pure C