msc: Only unregister the fd if the fd value is valid.
This makes sure that someone can call bsc_msc_lost multiple times
even if there is no MSC connection. This makes sense as bsc_msc_lost
is public and be called from client code.
diff --git a/openbsc/src/bsc_msc.c b/openbsc/src/bsc_msc.c
index a5734de..f116693 100644
--- a/openbsc/src/bsc_msc.c
+++ b/openbsc/src/bsc_msc.c
@@ -216,7 +216,9 @@
{
write_queue_clear(&con->write_queue);
bsc_del_timer(&con->timeout_timer);
- bsc_unregister_fd(&con->write_queue.bfd);
+
+ if (con->write_queue.bfd.fd >= 0)
+ bsc_unregister_fd(&con->write_queue.bfd);
connection_loss(con);
}