ata: pata_octeon_cf: fix error return code in octeon_cf_probe()

The variable 'rv' is set to 0 after calling of_property_read_reg(), so
it cannot be used as an error code. Change to using correct error codes
in the error path.

Fixes: d0b2461678b1 ("ata: Use of_property_read_reg() to parse "reg"")
Signed-off-by: Yang Yingliang <[e-mail]>
Reviewed-by: Sergey Shtylyov <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Signed-off-by: Damien Le Moal <[e-mail]>

drivers/ata/pata_octeon_cf.c

···
 	irq_handler_t irq_handler = NULL;
 	void __iomem *base;
 	struct octeon_cf_port *cf_port;
-	int rv = -ENOMEM;
 	u32 bus_width;
+	int rv;
 
 	node = pdev->dev.of_node;
 	if (node == NULL)
···
 	cs0 = devm_ioremap(&pdev->dev, res_cs0->start,
 				   resource_size(res_cs0));
 	if (!cs0)
-		return rv;
+		return -ENOMEM;
 
 	/* allocate host */
 	host = ata_host_alloc(&pdev->dev, 1);
 	if (!host)
-		return rv;
+		return -ENOMEM;
 
 	ap = host->ports[0];
 	ap->private_data = cf_port;