galera fix: MSAN reports use-of-uninitialized-value on binlog_encryption

This commit fixes a bug in MSAN verification in debug builds
related to the member of a lex->definer structure field that may
be uninitialized for some SET statements. The bug is caused by
debug output in a wsrep-specific insert and does not affect
server functionality.

sql/log_event_server.cc

@@ -1728,8 +1728,11 @@ int Query_log_event::do_apply_event(rpl_group_info *rgi,
     DBUG_PRINT("query",("%s", thd->query()));
 
 #ifdef WITH_WSREP
-    WSREP_DEBUG("Query_log_event thread=%llu for query=%s",
-		thd_get_thread_id(thd), wsrep_thd_query(thd));
+    if (WSREP(thd))
+    {
+      WSREP_DEBUG("Query_log_event thread=%llu for query=%s",
+		  thd_get_thread_id(thd), wsrep_thd_query(thd));
+    }
 #endif
 
     if (unlikely(!(expected_error= error_code)) ||

sql/service_wsrep.cc

@@ -82,8 +82,7 @@ extern "C" const char *wsrep_thd_query(const THD *thd)
     case SQLCOM_REVOKE:
       return "REVOKE";
     case SQLCOM_SET_OPTION:
-      if (thd->lex->definer)
-        return "SET PASSWORD";
+      return "SET OPTION";
       /* fallthrough */
     default:
     {