Make sure we hangup any calls we have and NULL out the ss7call value when we get a reset circuit message. Fixes crash bug. (from mattf r121857, moving from chan_zap to chan_dahdi)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@122243 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_dahdi.c

@@ -9425,6 +9425,10 @@ static void *ss7_linkset(void *data)
 				p->remotelyblocked = 0;
 				dpc = p->dpc;
 				isup_set_call_dpc(e->rsc.call, dpc);
+				if (p->ss7call)
+					p->ss7call = NULL;
+				if (p->owner)
+					p->owner->_softhangup |= AST_SOFTHANGUP_DEV;
 				ast_mutex_unlock(&p->lock);
 				isup_rlc(ss7, e->rsc.call);
 				break;