ide: pass error value to ide_complete_rq()

Set rq->errors at ide_complete_rq() call sites and then pass
error value to ide_complete_rq().

[ Some rq->errors assignments look really wrong but this patch
  leaves them alone to not introduce too many changes at once. ]

There should be no functional changes caused by this patch.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index a42e49c..3bfcd72 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -774,8 +774,8 @@
 		if (rq != postponed_rq) {
 			printk(KERN_ERR "ide-tape: ide-tape.c bug - "
 					"Two DSC requests were queued\n");
-			rq->errors = IDE_DRV_ERROR_GENERAL;
 			drive->failed_pc = NULL;
+			rq->errors = 0;
 			ide_complete_rq(drive, 0);
 			return ide_stopped;
 		}