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devshr: unmount service on #σc/share/mount removal

when the control mountpoint side gets removed, close
mount channel immediately. this is usefull for implementing
automatic cleanup with ORCLOSE create mode.

--- a/sys/src/9/port/devshr.c

+++ b/sys/src/9/port/devshr.c

@@ -554,6 +554,7 @@

 	Sch *sch;

 	Mpt *mpt;

 	Mhead *h;

+	Chan *bc;

 	sch = tosch(c);

 	if(waserror()){

@@ -593,6 +594,7 @@

 		qunlock(&shrslk);

 		break;

 	case Qcmpt:

+		bc = nil;

 		mpt = sch->mpt;

 		m = &mpt->m;

 		h = &shr->umh;

@@ -601,10 +603,14 @@

 			if(*ml == m){

 				*ml = m->next;

 				m->next = nil;

+				bc = m->to;

+				m->to = nil;

 				putmpt(mpt);

 				break;

 			}

 		wunlock(&h->lock);

+		if(bc != nil)

+			cclose(bc);

 		break;

 	}

 	poperror();