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screenlock: put position check back in grabmouse (thanks deuteron)

the check was there because changing te position causes another
mouse event to get posted resulting in grabmouse spinning.

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

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

@@ -91,8 +91,8 @@

 void

 grabmouse(void*)

 {

+	int fd, x, y;

 	char ibuf[256], obuf[256];

-	int fd;

 	if((fd = open("/dev/mouse", ORDWR)) < 0)

 		sysfatal("can't open /dev/mouse: %r");

@@ -102,9 +102,16 @@

 		screen->r.min.y + Dy(screen->r)/2);

 	while(read(fd, ibuf, sizeof ibuf) > 0){

-		if(!debug)

-			fprint(fd, "%s", obuf);

-		blank = time(0);

+		ibuf[12] = 0;

+		ibuf[24] = 0;

+		x = atoi(ibuf+1);

+		y = atoi(ibuf+13);

+		if(x != screen->r.min.x + Dx(screen->r)/2 ||

+		   y != screen->r.min.y + Dy(screen->r)/2){

+			if(!debug)

+				fprint(fd, "%s", obuf);

+			blank = time(0);

+		}

 	}

 }