[PATCH] libata: kill NULL qc handling from ->eng_timeout callbacks

->eng_timeout cannot be invoked with NULL qc anymore.  Add an
assertion in ata_scsi_error() and kill NULL qc handling from all
->eng_timeout callbacks.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
diff --git a/drivers/scsi/sata_mv.c b/drivers/scsi/sata_mv.c
index 1db05f2..6c80527 100644
--- a/drivers/scsi/sata_mv.c
+++ b/drivers/scsi/sata_mv.c
@@ -2027,13 +2027,8 @@
 	mv_err_intr(ap);
 	mv_stop_and_reset(ap);
 
-	if (!qc) {
-		printk(KERN_ERR "ata%u: BUG: timeout without command\n",
-		       ap->id);
-	} else {
-		qc->err_mask |= AC_ERR_TIMEOUT;
-		ata_eh_qc_complete(qc);
-	}
+	qc->err_mask |= AC_ERR_TIMEOUT;
+	ata_eh_qc_complete(qc);
 }
 
 /**