Use wtokenfree whenever there is wtokensplit

Whenever wtokensplit is used to split into argv/argc, it's better to
use the built-in function wtokenfree() as a wfree call only on argv
is not freeing the memory properly.

util/wmgenmenu.c

@@ -451,7 +451,7 @@ static void find_and_write(const char *group, char *list[][2], int this_is_termi
 			WMAddToPLArray(L2Menu, L3Menu);
 			wfree(t);
 		}
-		wfree(argv);
+		wtokenfree(argv, argc);
 		i++;
 	}
 	if (L2Menu)