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sshnet: don't leak "Dialing" connections when "connect" ctl write gets interrupted

--- a/sys/src/cmd/sshnet.c

+++ b/sys/src/cmd/sshnet.c

@@ -1086,11 +1086,13 @@

 		c->sendpkt = pkt;

 		c->sendwin = win;

 		c->servernum = n;

-		c->state = Established;

-		if(c->wq != nil){

-			respond(c->wq, nil);

-			c->wq = nil;

+		if(c->wq == nil){

+			teardownclient(c);

+			break;

 		}

+		respond(c->wq, nil);

+		c->wq = nil;

+		c->state = Established;

 		break;

 	case MSG_CHANNEL_OPEN_FAILURE:

 		if(unpack(m, "_u____s", &chan, &s, &n) < 0)