sierra: Fix formatting

Andrew Morton wrote:

in drivers/usb/serial/sierra.c:

        } else {
                if (urb->actual_length) {
+               tty = tty_port_tty_get(&port->port);
                        tty_buffer_request_room(tty, urb->actual_length);

it's missing a tab.
Signed-off-by: NAlan Cox <alan@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/usb/serial/sierra.c

@@ -442,7 +442,7 @@ static void sierra_indat_callback(struct urb *urb)
 		    " endpoint %02x.", __func__, status, endpoint);
 	} else {
 		if (urb->actual_length) {
-		tty = tty_port_tty_get(&port->port);
+			tty = tty_port_tty_get(&port->port);
 			tty_buffer_request_room(tty, urb->actual_length);
 			tty_insert_flip_string(tty, data, urb->actual_length);
 			tty_flip_buffer_push(tty);