atmel-usba-udc: use gpio_is_valid() to check vbus_pin I/O line
This patch will convert to use gpio_is_valid() to check the vbus_pin platform data. It will also default to -ENODEV if no vbus_pin is defined. Signed-off-by:Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com> Signed-off-by:
Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
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