hw/rdma: Abort send-op if fail to create addr handler

Function create_ah might return NULL, let's exit with an error.
Signed-off-by: NYuval Shaia <yuval.shaia@oracle.com>
Reviewed-by: NMarcel Apfelbaum <marcel.apfelbaum@gmail.com>
Signed-off-by: NMarcel Apfelbaum <marcel.apfelbaum@gmail.com>

hw/rdma/rdma_backend.c

@@ -338,6 +338,10 @@ void rdma_backend_post_send(RdmaBackendDev *backend_dev,
     if (qp_type == IBV_QPT_UD) {
         wr.wr.ud.ah = create_ah(backend_dev, qp->ibpd,
                                 backend_dev->backend_gid_idx, dgid);
+        if (!wr.wr.ud.ah) {
+            comp_handler(IBV_WC_GENERAL_ERR, VENDOR_ERR_FAIL_BACKEND, ctx);
+            goto out_dealloc_cqe_ctx;
+        }
         wr.wr.ud.remote_qpn = dqpn;
         wr.wr.ud.remote_qkey = dqkey;
     }