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devuart: fix wrong opens count in case of uartenable() error

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

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

@@ -143,10 +143,11 @@

 	p = uartport(which);

 	qlock(p);

-	if(p->opens++ == 0 && uartenable(p) == nil){

+	if(p->opens == 0 && uartenable(p) == nil){

 		qunlock(p);

 		error(Enodev);

 	}

+	p->opens++;

 	if(setb1200)

 		uartctl(p, "b1200");

 	p->putc = putc;

@@ -321,11 +322,12 @@

 	case Ndataqid:

 		p = uart[NETID(c->qid.path)];

 		qlock(p);

-		if(p->opens++ == 0 && uartenable(p) == nil){

+		if(p->opens == 0 && uartenable(p) == nil){

 			qunlock(p);

 			c->flag &= ~COPEN;

 			error(Enodev);

 		}

+		p->opens++;

 		qunlock(p);

 		break;

 	}

-- 

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