(find_new_gid): If oflg is set, gflg is also set.

Use (!gflg), which is cleared than (!gflg || !oflg).

src/groupadd.c

@@ -532,7 +532,7 @@ int main (int argc, char **argv)
 	 */
 	open_files ();
 
-	if (!gflg || !oflg) {
+	if (!gflg) {
 		find_new_gid ();
 	}