dist/net_rdma: fix shm allocation calculation for n2d queues.

Used d2n values before. (worked because these are symmetric in the cases
I've tested so far)

dist/net_rdma.c

@@ -234,7 +234,7 @@ int PeerNetSetupQueues(struct Peer *peer) {
     fprintf(stderr, "PeerNetSetupQueues: ShmAlloc d2n failed");
     return 1;
   }
-  if (ShmAlloc(di->d2n_elen * di->n2d_nentries, &di->n2d_offset)) {
+  if (ShmAlloc(di->n2d_elen * di->n2d_nentries, &di->n2d_offset)) {
     fprintf(stderr, "PeerNetSetupQueues: ShmAlloc n2d failed");
     return 1;
   }