media: solo6x10: hide unused variable

When building without CONFIG_GPIOLIB, we get a harmless
warning about an unused variable:

drivers/media/pci/solo6x10/solo6x10-gpio.c: In function 'solo_gpio_init':
drivers/media/pci/solo6x10/solo6x10-gpio.c:165:6: error: unused variable 'ret' [-Werror=unused-variable]

This adds another #ifdef around the declaration.

Fixes: d3202d1 ("media: solo6x10: export hardware GPIO pins 8:31 to gpiolib interface")

Signed-off-by: Arnd Bergmann <[email protected]>
Signed-off-by: Ismael Luceno <[email protected]>
Acked-by: Anton Sviridenko <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

Author: arndb

drivers/media/pci/solo6x10/solo6x10-gpio.c

@@ -162,7 +162,9 @@ static void solo_gpiochip_set(struct gpio_chip *chip,
 
 int solo_gpio_init(struct solo_dev *solo_dev)
 {
+#ifdef CONFIG_GPIOLIB
 	int ret;
+#endif
 
 	solo_gpio_config(solo_dev);
 #ifdef CONFIG_GPIOLIB