Fix error checking of storage in auth confirm

auth/confirm.go

@@ -132,7 +132,7 @@ func (s *state) confirm(partner contact.Contact, serviceTag string) (
 
 			/*send message*/
 			if err = s.store.StoreConfirmation(partner.ID, baseFmt.Marshal(),
-				mac, fp); err == nil {
+				mac, fp); err != nil {
 				jww.WARN.Printf("Failed to store confirmation for replay "+
 					"for relationship between %s and %s, cannot be replayed: %+v",
 					partner.ID, s.e2e.GetReceptionID(), err)