PVS-Studio warning V528 for OpenCV

int jpc_atoaf(char *s, int *numvalues, double **values)
{
  char *cp;
  ....
  while ((cp = strtok(0, delim))) {
    if (cp != '\0') {
      ++n;
    }
  }
  ....
}

This suspicious code was found in OpenCV project by PVS-Studio static code analyzer.
Warning message is:
V528 It is odd that pointer to 'char' type is compared with the '\0' value. Probably meant: *cp != '\0'. jpc_util.c 105

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/