greybus: connection: no need to verify connection->protocol

connection->protocol will always be valid in gb_connection_init() as it
is called only from a single routine, after initializing the 'protocol'
field.

No need to check it again.
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>

drivers/staging/greybus/connection.c

@@ -371,11 +371,6 @@ static int gb_connection_init(struct gb_connection *connection)
 	int cport_id = connection->intf_cport_id;
 	int ret;
 
-	if (!connection->protocol) {
-		dev_warn(&connection->dev, "init without protocol.\n");
-		return 0;
-	}
-
 	/*
 	 * Inform Interface about Active CPorts. We don't need to do this
 	 * operation for control cport.