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devtls: implement "hangup" ctl message

This makes devtls connection directories compatible to
hangup function (see dial(2)).

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

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

@@ -1751,10 +1751,10 @@

 	}else if(strcmp(cb->f[0], "alert") == 0){

 		if(cb->nf != 2)

 			error("usage: alert n");

+		m = strtol(cb->f[1], nil, 0);

+	Hangup:

 		if(tr->c == nil)

 			error("must set fd before sending alerts");

-		m = strtol(cb->f[1], nil, 0);

-

 		qunlock(&tr->in.seclock);

 		qunlock(&tr->out.seclock);

 		poperror();

@@ -1767,6 +1767,9 @@

 			tlsclosed(tr, SLClose);

 		return n;

+	} else if(strcmp(cb->f[0], "hangup") == 0){

+		m = ECloseNotify;

+		goto Hangup;

 	} else if(strcmp(cb->f[0], "debug") == 0){

 		if(cb->nf == 2){

 			if(strcmp(cb->f[1], "on") == 0)