Input: libps2 - fix switch statement formatting

Individual labels of switch statements should have the same indentation
level as the switch statement itself.
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/serio/libps2.c

@@ -321,7 +321,6 @@ int ps2_handle_ack(struct ps2dev *ps2dev, unsigned char data)
 		return 0;
 	}
 
-
 	if (!ps2dev->nak) {
 		ps2dev->flags &= ~PS2_FLAG_NAK;
 		if (ps2dev->cmdcnt)