[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/net/netiucv.c b/drivers/s390/net/netiucv.c
index d7d1cc0..3346088 100644
--- a/drivers/s390/net/netiucv.c
+++ b/drivers/s390/net/netiucv.c
@@ -2053,7 +2053,7 @@
 	return ret;
 }
 
-DRIVER_ATTR(connection, 0200, NULL, conn_write);
+static DRIVER_ATTR(connection, 0200, NULL, conn_write);
 
 static ssize_t
 remove_write (struct device_driver *drv, const char *buf, size_t count)
@@ -2112,7 +2112,7 @@
         return -EINVAL;
 }
 
-DRIVER_ATTR(remove, 0200, NULL, remove_write);
+static DRIVER_ATTR(remove, 0200, NULL, remove_write);
 
 static void
 netiucv_banner(void)