nbd: fix nbd_server_stop crash when no server was running
This failed on the new assertion of qemu_set_fd_handler2:
qemu-system-x86_64: /home/pbonzini/work/upstream/qemu/iohandler.c:60: qemu_set_fd_handler2: Assertion `fd >= 0' failed.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/blockdev-nbd.c b/blockdev-nbd.c
index 8031813..274fba6 100644
--- a/blockdev-nbd.c
+++ b/blockdev-nbd.c
@@ -113,7 +113,9 @@
nbd_close_notifier(&cn->n, nbd_export_get_blockdev(cn->exp));
}
- qemu_set_fd_handler2(server_fd, NULL, NULL, NULL, NULL);
- close(server_fd);
- server_fd = -1;
+ if (server_fd != -1) {
+ qemu_set_fd_handler2(server_fd, NULL, NULL, NULL, NULL);
+ close(server_fd);
+ server_fd = -1;
+ }
}
