ide-scsi: remove superfluous BUG_ON() from idescsi_transfer_pc()

ide_set_handler() bugs on ->handler == NULL so no need to do it
in idescsi_transfer_pc().

There should be no functional changes caused by this patch.

Cc: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/scsi/ide-scsi.c

@@ -469,7 +469,7 @@ static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
 				"issuing a packet command\n");
 		return ide_do_reset (drive);
 	}
-	BUG_ON(HWGROUP(drive)->handler != NULL);
+
 	/* Set the interrupt routine */
 	ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);