[master] 298ffb6 Relax an assertion for the IMS update candidate object

[Martin Blix Grydeland]

commit 298ffb63d3fb0c3e4a683acba0d9639d6901a655
Author: Martin Blix Grydeland <martin at varnish-software.com>
Date:   Tue Dec 16 18:05:54 2014 +0100

    Relax an assertion for the IMS update candidate object
    
    The streaming fetch of an object can fail between lookup time and when
    we actually use it. Relax this assertion.
    
    Fixes: #1647

diff --git a/bin/varnishd/cache/cache_req_fsm.c b/bin/varnishd/cache/cache_req_fsm.c
index 1078d34..b2e5aef 100644
--- a/bin/varnishd/cache/cache_req_fsm.c
+++ b/bin/varnishd/cache/cache_req_fsm.c
@@ -356,7 +356,7 @@ cnt_lookup(struct worker *wrk, struct req *req)
 	switch (wrk->handling) {
 	case VCL_RET_DELIVER:
 		if (boc != NULL) {
-			AZ(oc->flags & (OC_F_FAILED|OC_F_PASS));
+			AZ(oc->flags & OC_F_PASS);
 			AZ(oc->exp_flags & OC_EF_DYING);
 			AZ(boc->busyobj);
 			VBF_Fetch(wrk, req, boc, oc, VBF_BACKGROUND);