usb: image: microtek: stop SG processing after transfer errors

When an SG URB completes with an error, mts_do_sg() calls
mts_transfer_cleanup(), which completes the SCSI command through
scsi_done(). However, the callback continues advancing the scatterlist
and may submit another URB for a command that has already been
completed.

Return immediately after the cleanup so that no further processing is
performed on the completed command.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Diego Fernando Mancera Gomez <diegomancera.dev@gmail.com>
Acked-by: Oliver Neukum <oneukum@suse.com>
Link: https://patch.msgid.link/20260723195654.152104-1-diegomancera.dev@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/image/microtek.c

@@ -475,6 +475,7 @@ static void mts_do_sg (struct urb* transfer)
 	if (unlikely(status)) {
                 set_host_byte(context->srb, (status == -ENOENT ? DID_ABORT : DID_ERROR));
 		mts_transfer_cleanup(transfer);
+		return;
         }
 
 	context->curr_sg = sg_next(context->curr_sg);