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>

drivers/staging/greybus/protocol.c

@@ -13,7 +13,7 @@ static DEFINE_SPINLOCK(gb_protocols_lock);
 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;