ivshmem: print error on invalid peer id

The server shouldn't send invalid peer id, so print an error if it's the
case.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Claudio Fontana <claudio.fontana@huawei.com>

hw/misc/ivshmem.c

@@ -399,6 +399,7 @@ static void close_guest_eventfds(IVShmemState *s, int posn)
         return;
     }
     if (posn < 0 || posn >= s->nb_peers) {
+        error_report("invalid peer %d", posn);
         return;
     }