firewire: fix return code

Fix this warning on x86-64

drivers/firewire/fw-cdev.c:798: warning: initialization from incompatible pointer type

by making the return code of ioctl_send_request() the same as all the
other ioctl_xxx() return codes.
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

drivers/firewire/fw-cdev.c

@@ -365,7 +365,7 @@ complete_transaction(struct fw_card *card, int rcode,
 		    response->response.data, response->response.length);
 }
 
-static ssize_t ioctl_send_request(struct client *client, void *buffer)
+static int ioctl_send_request(struct client *client, void *buffer)
 {
 	struct fw_device *device = client->device;
 	struct fw_cdev_send_request *request = buffer;