[SERMOUSE]: Sun mice speak 5-byte protocol too.

Noticed by Christophe Zimmerman, this explains the slow mouse movement
with 2.6.x kernels.

And checking the 2.4.x drivers/sbus/char/sunmouse.c driver shows we
always used a 5-byte protocol with Sun mice in the past.  I have no
idea how the 3-byte thing got into the 2.6.x driver, but it's surely
wrong.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/input/mouse/sermouse.c

@@ -95,7 +95,7 @@ static void sermouse_process_msc(struct sermouse *sermouse, signed char data, st
 
 	input_sync(dev);
 
-	if (++sermouse->count == (5 - ((sermouse->type == SERIO_SUN) << 1)))
+	if (++sermouse->count == 5)
 		sermouse->count = 0;
 }