[S390] cio: Make some structures and a function static.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 27c6d9e..dfca0ef 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -191,8 +191,7 @@
 	return ret;
 }
 
-int
-css_probe_device(struct subchannel_id schid)
+static int css_probe_device(struct subchannel_id schid)
 {
 	int ret;
 	struct subchannel *sch;