Fix crash with no monitors left

When there's no monitors left, prevent the while in cleanupmon() to
become an infinite loop

Also switch to the left monitors instead of the right

1 files changed, 3 insertions, 4 deletions

diff --git a/dwl.c b/dwl.c
index ca352c4..d875eaa 100644
--- a/dwl.c
+++ b/dwl.c
@@ -696,20 +696,19 @@ cleanupmon(struct wl_listener *listener, void *data)
 {
 	struct wlr_output *wlr_output = data;
 	Monitor *m = wlr_output->data;
+	int nmons = wl_list_length(&mons), i = 0;
 
 	wl_list_remove(&m->destroy.link);
 	wl_list_remove(&m->frame.link);
 	wl_list_remove(&m->link);
 	wlr_output_layout_remove(output_layout, m->wlr_output);
-
 	updatemons();
 
 	do // don't switch to disabled mons
-		selmon = wl_container_of(mons.next, selmon, link);
-	while (!selmon->wlr_output->enabled);
+		selmon = wl_container_of(mons.prev, selmon, link);
+	while (!selmon->wlr_output->enabled && i++ < nmons);
 	focusclient(selclient(), focustop(selmon), 1);
 	closemon(m);
-
 	free(m);
 }