ide: add ide_end_rq() (v2)

* Move request dequeuing from __ide_end_request() to ide_end_request().

* Rename __ide_end_request() to ide_end_rq() and export it.

* Fix ide_end_rq() to pass original blk_end_request() return value.

* ide_end_dequeued_request() is used only in cdrom_end_request()
  so inline it there and then remove the function.

v2:
* Remove needless BUG_ON() while at it (start_request()'s one is enough).

There should be no functional changes caused by this patch.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-cd.c

@@ -272,8 +272,8 @@ static void cdrom_end_request(ide_drive_t *drive, int uptodate)
 			 * now end the failed request
 			 */
 			if (blk_fs_request(failed)) {
-				if (ide_end_dequeued_request(drive, failed, 0,
-						failed->hard_nr_sectors))
+				if (ide_end_rq(drive, failed, 0,
+						failed->hard_nr_sectors << 9))
 					BUG();
 			} else {
 				if (blk_end_request(failed, -EIO,