title: xcode Assertion failed
body: <p>On build of a project I am getting an Assertion failed pointing at this code. Any ideas why please? I have tried a cleaning, deleting derived data, closing xcode and more. Any help please.   </p>
  
  <pre><code>unsigned int
  FNVForCString(
      const char* s)
  {
  assert(s);
  
  unsigned int hash = 2166136261;
  int ch;
  while (0 != (ch = *s++))
  {
      hash *= 16777619;
      hash ^= ch;
  }
  return hash;
  }
  </code></pre>
  
  <p>Just going to say it is failing on the assert(s); line.</p>