migration/rdma: Remove deprecated variable rdma_return_path

It's no longer needed since commit
44bcfd45e98 ("migration/rdma: destination: create the return patch after the first accept")

Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>

migration/rdma.c

@@ -4111,7 +4111,7 @@ static void rdma_accept_incoming_migration(void *opaque)
 void rdma_start_incoming_migration(const char *host_port, Error **errp)
 {
     int ret;
-    RDMAContext *rdma, *rdma_return_path = NULL;
+    RDMAContext *rdma;
     Error *local_err = NULL;
 
     trace_rdma_start_incoming_migration();
@@ -4157,7 +4157,6 @@ err:
         g_free(rdma->host_port);
     }
     g_free(rdma);
-    g_free(rdma_return_path);
 }
 
 void rdma_start_outgoing_migration(void *opaque,