[MTD] Make init_redwood_flash function static

The function init_redwood_flash is needlessly defined global,
make it static by this patch.

Signed-off-by: Dmitri Vorobiev <dmitri.vorobiev@movial.fi>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/mtd/maps/redwood.c b/drivers/mtd/maps/redwood.c
index de002eb..933c0b6 100644
--- a/drivers/mtd/maps/redwood.c
+++ b/drivers/mtd/maps/redwood.c
@@ -122,7 +122,7 @@
 
 static struct mtd_info *redwood_mtd;
 
-int __init init_redwood_flash(void)
+static int __init init_redwood_flash(void)
 {
 	int err;