BUG#21960: Unbalanced data in MySQL Cluster 5.1 for number of node groups > 1

Fixed bad initialisation of default_node_group, failed to take into
account fact that first node group is set to zero

storage/ndb/src/kernel/blocks/dbdih/DbdihMain.cpp

@@ -6610,6 +6610,11 @@ void Dbdih::execCREATE_FRAGMENTATION_REQ(Signal * signal)
       Uint16 next_replica_node[MAX_NDB_NODES];
       memset(next_replica_node,0,sizeof(next_replica_node));
       Uint32 default_node_group= c_nextNodeGroup;
+      /**
+       * Default starts at zero, so we must adjust for this by
+       * increasing default_node_group already here.
+       */
+      inc_node_or_group(default_node_group, cnoOfNodeGroups);
       for(Uint32 fragNo = 0; fragNo < noOfFragments; fragNo++)
       {
         jam();