usb: storage: karma: remove useless variable

Remove the useless variable 'partial' storing the actual length
transferred. Nothing was done with it, so simply get rid of it
as usb_stor_bulk_transfer_buf can handle having NULL instead.

This also fixes the following sparse issues (-Wtypesign):
drivers/usb/storage/karma.c:122:51: warning: incorrect type in argument
5 (different signedness)
drivers/usb/storage/karma.c:122:51: expected unsigned int *act_len
drivers/usb/storage/karma.c:122:51: got int *<noident>
drivers/usb/storage/karma.c:127:52: warning: incorrect type in argument
5 (different signedness)
drivers/usb/storage/karma.c:127:52: expected unsigned int *act_len
drivers/usb/storage/karma.c:127:52: got int *<noident>

Signed-off-by: Pierre-Yves Kerbrat <[e-mail]>
Acked-by: Alan Stern <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/storage/karma.c

···
  */
 static int rio_karma_send_command(char cmd, struct us_data *us)
 {
-	int result, partial;
+	int result;
 	unsigned long timeout;
 	static unsigned char seq = 1;
 	struct karma_data *data = (struct karma_data *) us->extra;
···
 	timeout = jiffies + msecs_to_jiffies(6000);
 	for (;;) {
 		result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
-			us->iobuf, RIO_SEND_LEN, &partial);
+			us->iobuf, RIO_SEND_LEN, NULL);
 		if (result != USB_STOR_XFER_GOOD)
 			goto err;
 
 		result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
-			data->recv, RIO_RECV_LEN, &partial);
+			data->recv, RIO_RECV_LEN, NULL);
 		if (result != USB_STOR_XFER_GOOD)
 			goto err;