Input: make some variables and functions static

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/tablet/wacom_wac.c b/drivers/input/tablet/wacom_wac.c
index 8dc8d1e..2638811 100644
--- a/drivers/input/tablet/wacom_wac.c
+++ b/drivers/input/tablet/wacom_wac.c
@@ -535,7 +535,7 @@
 	return 1;
 }
 
-int wacom_tpc_irq(struct wacom_wac *wacom, void *wcombo)
+static int wacom_tpc_irq(struct wacom_wac *wacom, void *wcombo)
 {
 	char *data = wacom->data;
 	int prox = 0, pressure;