[libata] pata_ixp4xx: kill unused var

Reported by Michael-Luke Jones.
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/ata/pata_ixp4xx_cf.c

@@ -171,7 +171,6 @@ static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
 	struct ata_host *host;
 	struct ata_port *ap;
 	struct ixp4xx_pata_data *data = pdev->dev.platform_data;
-	int rc;
 
 	cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);