Index: if.c
===================================================================
RCS file: /cvs/src/sys/net/if.c,v
retrieving revision 1.600
diff -u -p -r1.600 if.c
--- if.c	24 Jan 2020 05:14:51 -0000	1.600
+++ if.c	10 Mar 2020 00:24:00 -0000
@@ -1050,10 +1050,9 @@ if_hooks_run(struct task_list *hooks)
 
 	mtx_enter(&if_hooks_mtx);
 	for (t = TAILQ_FIRST(hooks); t != NULL; t = nt) {
-		while (t->t_func == NULL) { /* skip cursors */
-			t = TAILQ_NEXT(t, t_entry);
-			if (t == NULL)
-				break;
+		if (t->t_func == NULL) { /* skip cursors */
+			nt = TAILQ_NEXT(t, t_entry);
+			continue;
 		}
 		func = t->t_func;
 		arg = t->t_arg;