[ide] remove NULL checking in ide_error()

In ide_error(), drive cannot be NULL.  ide_dump_status() can't
handle NULL drive.

From: Tejun Heo <tj@home-tj.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-io.c

@@ -555,7 +555,7 @@ ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat)
 
 	err = ide_dump_status(drive, msg, stat);
 
-	if (drive == NULL || (rq = HWGROUP(drive)->rq) == NULL)
+	if ((rq = HWGROUP(drive)->rq) == NULL)
 		return ide_stopped;
 
 	/* retry only "normal" I/O: */