PVS-Studio warning V510 for Quake3

typedef struct punctuation_s
{
  char *p;
  int n;
  struct punctuation_s *next;
} punctuation_t;

punctuation_t *punctuations;

int PS_ExpectTokenType(
  script_t *script, int type, int subtype, token_t *token)
{
  ...
  ScriptError(script, "expected %s, found %s",
    script->punctuations[subtype], token->string);
  ...
}

This suspicious code was found in Quake3 project by PVS-Studio static code analyzer.
Warning message is:
V510 The 'ScriptError' function is not expected to receive class-type variable as third actual argument. botlib l_script.c 992

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/