gpiolib: Fix using uninitialized lookup-flags on ACPI platforms

Commit 8eb1f71 ("gpiolib: consolidate GPIO lookups") refactors
fwnode_get_named_gpiod() and gpiod_get_index() into a unified
gpiod_find_and_request() helper.

The old functions both initialized their local lookupflags variable to
GPIO_LOOKUP_FLAGS_DEFAULT, but the new code leaves it uninitialized.

This is a problem for at least ACPI platforms, where acpi_find_gpio()
only does a bunch of *lookupflags |= GPIO_* statements and thus relies
on the variable being initialized.

The variable not being initialized leads to:

1. Potentially the wrong flags getting used
2. The check for conflicting lookup flags in gpiod_configure_flags():
   "multiple pull-up, pull-down or pull-disable enabled, invalid config"
   sometimes triggering, making the GPIO unavailable

Restore the initialization of lookupflags to GPIO_LOOKUP_FLAGS_DEFAULT
to fix this.

Fixes: 8eb1f71 ("gpiolib: consolidate GPIO lookups")
Signed-off-by: Hans de Goede <[email protected]>
Signed-off-by: Bartosz Golaszewski <[email protected]>

Author: jwrdegoede

drivers/gpio/gpiolib.c

@@ -3905,8 +3905,8 @@ static struct gpio_desc *gpiod_find_and_request(struct device *consumer,
 						const char *label,
 						bool platform_lookup_allowed)
 {
+	unsigned long lookupflags = GPIO_LOOKUP_FLAGS_DEFAULT;
 	struct gpio_desc *desc = ERR_PTR(-ENOENT);
-	unsigned long lookupflags;
 	int ret;
 
 	if (!IS_ERR_OR_NULL(fwnode))