[master] 7ddc595 Add a documentary assert

[Poul-Henning Kamp]

commit 7ddc5950d1c6bc77966b1b93654fea864256e40b
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date:   Wed Feb 3 09:54:58 2016 +0000

    Add a documentary assert

diff --git a/bin/varnishd/cache/cache_ban.c b/bin/varnishd/cache/cache_ban.c
index 2838914..b0f53ad 100644
--- a/bin/varnishd/cache/cache_ban.c
+++ b/bin/varnishd/cache/cache_ban.c
@@ -509,6 +509,7 @@ BAN_CheckObject(struct worker *wrk, struct objcore *oc, struct req *req)
 
 	CHECK_OBJ_NOTNULL(oc, OBJCORE_MAGIC);
 	CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
+	Lck_AssertHeld(&oc->objhead->mtx);
 
 	vsl = req->vsl;