hash: Missing oh null check in HSH_Fail()

Author: dridi

bin/varnishd/cache/cache_hash.c

@@ -915,7 +915,7 @@ HSH_Fail(struct worker *wrk, struct objcore *oc)
 	CHECK_OBJ_NOTNULL(oc, OBJCORE_MAGIC);
 	CHECK_OBJ_NOTNULL(oc->boc, BOC_MAGIC);
 	oh = oc->objhead;
-	CHECK_OBJ(oh, OBJHEAD_MAGIC);
+	CHECK_OBJ_NOTNULL(oh, OBJHEAD_MAGIC);
 	INIT_OBJ(&rush, RUSH_MAGIC);
 
 	/*