Merge pull request #12966 from dillaman/wip-18436

osdc: cache should ignore error bhs during trim

Reviewed-by: John Spray <john.spray@redhat.com>
Reviewed-by: Gregory Farnum <gfarnum@redhat.com>

src/osdc/ObjectCacher.cc

@@ -1234,7 +1234,7 @@ void ObjectCacher::trim()
       break;
 
     ldout(cct, 10) << "trim trimming " << *bh << dendl;
-    assert(bh->is_clean() || bh->is_zero());
+    assert(bh->is_clean() || bh->is_zero() || bh->is_error());
 
     Object *ob = bh->ob;
     bh_remove(ob, bh);