[S390] Get rid of a lot of sparse warnings.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/char/con3270.c b/drivers/s390/char/con3270.c
index 7566be8..8e7f2d7 100644
--- a/drivers/s390/char/con3270.c
+++ b/drivers/s390/char/con3270.c
@@ -69,8 +69,7 @@
 /*
  * Setup timeout for a device. On timeout trigger an update.
  */
-void
-con3270_set_timer(struct con3270 *cp, int expires)
+static void con3270_set_timer(struct con3270 *cp, int expires)
 {
 	if (expires == 0) {
 		if (timer_pending(&cp->timer))