correct omap mouse

Reference: /n/atom/patch/applied/omapmouse
Date: Fri Jun  6 19:13:06 CES 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/9/omap/mouse.c	Fri Jun  6 19:13:06 2014
+++ /sys/src/9/omap/mouse.c	Fri Jun  6 19:13:06 2014
@@ -86,16 +86,16 @@
  * after the previous byte, we assume it's the first in a packet.
  */
 static void
-ps2mouseputc(int c, int shift)
+ps2mouseputc(int c)
 {
 	static short msg[4];
 	static int nb;
 	static uchar b[] = {0, 1, 4, 5, 2, 3, 6, 7, 0, 1, 2, 3, 2, 3, 6, 7 };
 	static ulong lasttick;
 	ulong m;
-	int buttons, dx, dy;
+	int shift, buttons, dx, dy;
 
-	shift |= mouseshifted;
+	shift = mouseshifted;
 	m = MACHP(0)->ticks;
 	if(TK2SEC(m - lasttick) > 2)
 		nb = 0;