ide: make ide_special_rq() BUG() on unknown requests

If unknown request reaches this function something is _seriously_ wrong.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index c33a800..0873887 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -357,9 +357,7 @@
 	case REQ_DRIVE_RESET:
 		return ide_do_reset(drive);
 	default:
-		blk_dump_rq_flags(rq, "ide_special_rq - bad request");
-		ide_end_request(drive, 0, 0);
-		return ide_stopped;
+		BUG();
 	}
 }