Silence unnecessary warning.

mysql-test/suite/galera/r/MW-328A.result

@@ -14,7 +14,10 @@ END|
 connect node_1X, 127.0.0.1, root, , test, $NODE_MYPORT_1;
 connection node_1X;
 CALL proc_update();;
+connection node_1;
+call mtr.add_suppression("WSREP: Wait for gtid returned error 3 while waiting for prior transactions to commit before setting position");
 connection node_2;
+call mtr.add_suppression("WSREP: Wait for gtid returned error 3 while waiting for prior transactions to commit before setting position");
 SET SESSION wsrep_retry_autocommit = 0;
 connection node_1;
 connection node_1X;

mysql-test/suite/galera/t/MW-328A.test

@@ -16,7 +16,11 @@
 --source include/force_restart.inc
 --source suite/galera/t/MW-328-header.inc
 
+--connection node_1
+call mtr.add_suppression("WSREP: Wait for gtid returned error 3 while waiting for prior transactions to commit before setting position");
+
 --connection node_2
+call mtr.add_suppression("WSREP: Wait for gtid returned error 3 while waiting for prior transactions to commit before setting position");
 --let $count = 100
 --let $successes = 0
 --let $deadlocks = 0