pata_legacy: don't call ata_host_detach() after initialization failure

ata_host_detach() detaches an attached port and shouldn't be called on
a port which hasn't been attached yet.  pata_legacy incorrectly calls
ata_host_detach() on unattached port after initialization failure
causing oops.  Fix it.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/ata/pata_legacy.c

@@ -1278,8 +1278,6 @@ static __init int legacy_init_one(struct legacy_probe *probe)
 		}
 	}
 fail:
-	if (host)
-		ata_host_detach(host);
 	platform_device_unregister(pdev);
 	return ret;
 }