Fix for infinite loop when there is only one client and pushup is run twice

patch/push.c

@@ -40,10 +40,12 @@ pushup(const Arg *arg)
 	} else {
 		/* move to the end */
 		for (c = sel; c->next; c = c->next);
+		if (sel != c) {
 			detach(sel);
 			sel->next = NULL;
 			c->next = sel;
 		}
+	}
 	focus(sel);
 	arrange(selmon);
 }