PVS-Studio warning V528 for Scilab

struct PLD_strtok
{
  char *start;
  char delimeter;
};

char *PLD_strtok(....)
{
  ....
  if ((st->start)&&(st->start != '\0'))
  ....
}

This suspicious code was found in Scilab 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: *st->start != '\0'. pldstr.c 303

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/