leds: gpio: Move temporary variable for struct device to gpio_led_probe()

Use temporary variable for struct device in gpio_led_probe() in order
to make code neater.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20231016161005.1471768-4-andriy.shevchenko@linux.intel.com


Signed-off-by: Lee Jones <lee@kernel.org>