gpiolib: gpio_name_to_desc: factor out !name check

Since name == NULL can't ever match, move the check out of
IRQ-disabled region.

Signed-off-by: Michał Mirosław <[e-mail]>
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/gpiolib.c

···
 	struct gpio_device *gdev;
 	unsigned long flags;
 
+	if (!name)
+		return NULL;
+
 	spin_lock_irqsave(&gpio_lock, flags);
 
 	list_for_each_entry(gdev, &gpio_devices, list) {
···
 		for (i = 0; i != gdev->ngpio; ++i) {
 			struct gpio_desc *desc = &gdev->descs[i];
 
-			if (!desc->name || !name)
+			if (!desc->name)
 				continue;
 
 			if (!strcmp(desc->name, name)) {