10333 cw: error: comparison between pointer and zero character constant

@@ -596,11 +596,11 @@
 static boolean_t
 is_source_file(const char *path)
 {
         char *ext = strrchr(path, '.');
 
-        if ((ext == NULL) || ((ext + 1) == '\0'))
+        if ((ext == NULL) || (*(ext + 1) == '\0'))
                 return (B_FALSE);
 
         ext += 1;
 
         if ((strcasecmp(ext, "c") == 0) ||