[libata] ata_piix: properly terminate DMI system list

If you don't terminate a list, bad things happen...

Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index e40c94f..3b8bf18 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -955,7 +955,8 @@
 				DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE M500"),
 			},
 		},
-		{ }
+
+		{ }	/* terminate list */
 	};
 	static const char *oemstrs[] = {
 		"Tecra M3,",
@@ -1187,6 +1188,8 @@
 				DMI_MATCH(DMI_PRODUCT_NAME, "M570U"),
 			},
 		},
+
+		{ }	/* terminate list */
 	};
 	u32 iocfg;