5218 posix definition of NULL
correct unistd.h and iso/stddef_iso.h
update gate source affected

@@ -197,11 +197,11 @@
          */
         if (_sp == 1) {
                 if (optind >= argc || argv[optind][0] != '-' ||
                     argv[optind] == NULL || argv[optind][1] == '\0')
                         return (EOF);
-                else if (strcmp(argv[optind], "--") == NULL) {
+                else if (strcmp(argv[optind], "--") == 0) {
                         optind++;
                         return (EOF);
                 }
         }