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devmouse: allow multiple writers on /dev/mousein

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

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

@@ -44,7 +44,6 @@

 	Ref;

 	QLock;

 	int	open;

-	int	inopen;

 	int	acceleration;

 	int	maxacc;

 	Mousestate	queue[16];	/* circular buffer of click events */

@@ -191,13 +190,6 @@

 	case Qmousein:

 		if(!iseve())

 			error(Eperm);

-		lock(&mouse);

-		if(mouse.inopen){

-			unlock(&mouse);

-			error(Einuse);

-		}

-		mouse.inopen = 1;

-		unlock(&mouse);

 		break;

 	default:

 		incref(&mouse);

@@ -225,7 +217,6 @@

 		if(c->qid.path == Qmouse)

 			mouse.open = 0;

 		else if(c->qid.path == Qmousein){

-			mouse.inopen = 0;

 			unlock(&mouse);

 			return;

 		}

-- 

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