[PATCH] ata: fix platform_device_register_simple() error check

The return value of platform_device_register_simple() should be checked
by IS_ERR().

Cc: Jeff Garzik <jgarzik@pobox.com>
Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/ata/pata_qdi.c b/drivers/ata/pata_qdi.c
index 36f621a..afc0d99 100644
--- a/drivers/ata/pata_qdi.c
+++ b/drivers/ata/pata_qdi.c
@@ -247,8 +247,8 @@
 	 */
 
 	pdev = platform_device_register_simple(DRV_NAME, nr_qdi_host, NULL, 0);
-	if (pdev == NULL)
-		return -ENOMEM;
+	if (IS_ERR(pdev))
+		return PTR_ERR(pdev);
 
 	memset(&ae, 0, sizeof(struct ata_probe_ent));
 	INIT_LIST_HEAD(&ae.node);