PVS-Studio warning V666 for OpenSSL

static int www_body(....)
{
  ....
  if ( ((www == 1) && (strncmp("GET ",buf,4) == 0)) ||
       ((www == 2) && (strncmp("GET /stats ",buf,10) == 0)))
  ....
}

This suspicious code was found in OpenSSL project by PVS-Studio static code analyzer.
Warning message is:
V666 Consider inspecting third argument of the function 'strncmp'. It is possible that the value does not correspond with the length of a string which was passed with the first argument. s_server.c 2703

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