vhost-user: add missing space in error message

This would previously give error messages like

> Received unexpected msg type.Expected 0 received 1

Signed-off-by: Alyssa Ross <hi@alyssa.is>
Message-Id: <20210806143926.315725-1-hi@alyssa.is>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
index a4eb6cd..360d9bc 100644
--- a/hw/virtio/vhost-user.c
+++ b/hw/virtio/vhost-user.c
@@ -429,7 +429,7 @@
     }
 
     if (msg_reply.hdr.request != msg->hdr.request) {
-        error_report("Received unexpected msg type."
+        error_report("Received unexpected msg type. "
                      "Expected %d received %d",
                      msg->hdr.request, msg_reply.hdr.request);
         return -1;