greybus: make _gb_protocol_find() static

This function should have private scope.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
diff --git a/drivers/staging/greybus/protocol.c b/drivers/staging/greybus/protocol.c
index 52944ec..e0bcd4b 100644
--- a/drivers/staging/greybus/protocol.c
+++ b/drivers/staging/greybus/protocol.c
@@ -13,7 +13,7 @@
 static LIST_HEAD(gb_protocols);
 
 /* Caller must hold gb_protocols_lock */
-struct gb_protocol *_gb_protocol_find(u8 id)
+static struct gb_protocol *_gb_protocol_find(u8 id)
 {
 	struct gb_protocol *protocol;