Fix for a memory leak.

sql/wsrep_mysqld.cc

@@ -1199,6 +1199,7 @@ static int wsrep_TOI_begin(THD *thd, char *db_, char *table_,
   uchar* buf(0);
   size_t buf_len(0);
   int buf_err;
+  int rc= 0;
 
   WSREP_DEBUG("TO BEGIN: %lld, %d : %s", (long long)wsrep_thd_trx_seqno(thd),
               thd->wsrep_exec_mode, thd->query() );
@@ -1238,7 +1239,6 @@ static int wsrep_TOI_begin(THD *thd, char *db_, char *table_,
   {
     thd->wsrep_exec_mode= TOTAL_ORDER;
     wsrep_to_isolation++;
-    if (buf) my_free(buf);
     wsrep_keys_free(&key_arr);
     WSREP_DEBUG("TO BEGIN: %lld, %d",(long long)wsrep_thd_trx_seqno(thd),
 		thd->wsrep_exec_mode);
@@ -1250,18 +1250,18 @@ static int wsrep_TOI_begin(THD *thd, char *db_, char *table_,
                ret, (thd->query()) ? thd->query() : "void");
     my_error(ER_LOCK_DEADLOCK, MYF(0), "WSREP replication failed. Check "
 	     "your wsrep connection state and retry the query.");
-    if (buf) my_free(buf);
     wsrep_keys_free(&key_arr);
-    return -1;
+    rc= -1;
   }
   else {
     /* non replicated DDL, affecting temporary tables only */
     WSREP_DEBUG("TO isolation skipped for: %d, sql: %s."
 		"Only temporary tables affected.",
 		ret, (thd->query()) ? thd->query() : "void");
-    return 1;
+    rc= 1;
   }
-  return 0;
+  if (buf) my_free(buf);
+  return rc;
 }
 
 static void wsrep_TOI_end(THD *thd) {