[master] 266ce5fb5 Always AN function pointers before use.

[Poul-Henning Kamp]

commit 266ce5fb50811718dbf6b629602afb347196cafc
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date:   Tue Oct 12 11:04:43 2021 +0000

    Always AN function pointers before use.

diff --git a/bin/varnishd/cache/cache_wrk.c b/bin/varnishd/cache/cache_wrk.c
index db4139a98..b8bc3efbd 100644
--- a/bin/varnishd/cache/cache_wrk.c
+++ b/bin/varnishd/cache/cache_wrk.c
@@ -483,6 +483,7 @@ Pool_Work_Thread(struct pool *pp, struct worker *wrk)
 		do {
 			memset(wrk->task, 0, sizeof wrk->task);
 			assert(wrk->pool == pp);
+			AN(tp->func);
 			tp->func(wrk, tp->priv);
 			if (DO_DEBUG(DBG_VCLREL) && wrk->wpriv->vcl != NULL)
 				VCL_Rel(&wrk->wpriv->vcl);