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apply ps2mouse corruption fix to omap

the omap ps2mouse driver is currently unused, but
in case of being finished at some point, apply the
fix from the pc driver.

--- a/sys/src/9/omap/mouse.c

+++ b/sys/src/9/omap/mouse.c

@@ -107,7 +107,7 @@

 		}

 	msg[nb] = c;

-	if(++nb == packetsize){

+	if(++nb >= packetsize){

 		nb = 0;

 		if(msg[0] & 0x10)

 			msg[1] |= 0xFF00;

@@ -142,13 +142,13 @@

 	if(mousetype == MousePS2)

 		return;

-//	i8042auxenable(ps2mouseputc);

-//	i8042auxcmd(0xEA);	// TODO

-//	i8042auxcmd(0xF4);

-

 	mousetype = MousePS2;

 	packetsize = 3;

 	mousehwaccel = 1;

+

+//	i8042auxenable(ps2mouseputc);

+//	i8042auxcmd(0xEA);	// TODO

+//	i8042auxcmd(0xF4);

 }

 /*