sata_fsl: Return non-zero on error in probe()

while I was looking over kernel sources I've found this small bug.

Formerly, zero was returned even if an error happened.

Signed-off-by: Michal Sojka <sojkam1@fel.cvut.cz>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/ata/sata_fsl.c b/drivers/ata/sata_fsl.c
index 1a56db9..55bc88c 100644
--- a/drivers/ata/sata_fsl.c
+++ b/drivers/ata/sata_fsl.c
@@ -1288,7 +1288,7 @@
 static int sata_fsl_probe(struct of_device *ofdev,
 			const struct of_device_id *match)
 {
-	int retval = 0;
+	int retval = -ENXIO;
 	void __iomem *hcr_base = NULL;
 	void __iomem *ssr_base = NULL;
 	void __iomem *csr_base = NULL;