gpio: of: initialize local variable passed to the .of_xlate() callback

of_flags is passed down to GPIO chip's xlate function, so ensure this one
is properly initialized as - if the xlate callback does nothing with it
- we may end up with various configuration errors like:

    gpio-720 (enable): multiple pull-up, pull-down or pull-disable enabled, invalid configuration

Signed-off-by: Alexander Stein <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[Bartosz: tweaked the commit message]
Signed-off-by: Bartosz Golaszewski <[email protected]>

Author: tq-steina

drivers/gpio/gpiolib-of.c

@@ -708,7 +708,7 @@ struct gpio_desc *of_find_gpio(struct device_node *np, const char *con_id,
 			       unsigned int idx, unsigned long *flags)
 {
 	char propname[32]; /* 32 is max size of property name */
-	enum of_gpio_flags of_flags;
+	enum of_gpio_flags of_flags = 0;
 	const of_find_gpio_quirk *q;
 	struct gpio_desc *desc;