mfd: rdc321x: Fix off-by-one for ngpio setting

The valid gpio is GPIO0 ~ GPIO58, so ngpio should be 59.
This patch also renames RDC321X_MAX_GPIO to RDC321X_NUM_GPIO because it
actually means the number of available GPIOs.

Signed-off-by: Axel Lin <[e-mail]>
Acked-by: Linus Walleij <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/rdc321x-southbridge.c

···
 };
 
 static struct rdc321x_gpio_pdata rdc321x_gpio_pdata = {
-	.max_gpios	= RDC321X_MAX_GPIO,
+	.max_gpios	= RDC321X_NUM_GPIO,
 };
 
 static struct resource rdc321x_gpio_resources[] = {

include/linux/mfd/rdc321x.h

···
 #define RDC321X_GPIO_CTRL_REG2	0x84
 #define RDC321X_GPIO_DATA_REG2	0x88
 
-#define RDC321X_MAX_GPIO	58
+#define RDC321X_NUM_GPIO	59
 
 struct rdc321x_gpio_pdata {
 	struct pci_dev *sb_pdev;