Fix wrong undefs of local macros for registering constants

Author: sodabrew

Diff for: php_memcached.c

@@ -4514,12 +4514,15 @@ static void php_memc_register_constants(INIT_FUNC_ARGS)
 	REGISTER_MEMC_CLASS_CONST_LONG(RESPONSE_ETMPFAIL,        PROTOCOL_BINARY_RESPONSE_ETMPFAIL);
 #endif
 
-	#undef REGISTER_MEMC_CLASS_CONST_LONG
-
 	/*
 	 * Return value from simple get errors
 	 */
 	REGISTER_MEMC_CLASS_CONST_BOOL(GET_ERROR_RETURN_VALUE, 0);
+
+	#undef REGISTER_MEMC_CLASS_CONST_LONG
+	#undef REGISTER_MEMC_CLASS_CONST_BOOL
+	#undef REGISTER_MEMC_CLASS_CONST_NULL
+
 }
 /* }}} */