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gpio: bail out silently on NULL descriptors
In fdeb8e1 ("gpio: reflect base and ngpio into gpio_device") assumed that GPIO descriptors are either valid or error pointers, but gpiod_get_[index_]optional() actually return NULL descriptors and then all subsequent calls should just bail out. Cc: stable@vger.kernel.org Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: Andrew Lunn <andrew@lunn.ch> Fixes: fdeb8e1 ("gpio: reflect base and ngpio into gpio_device") Reported-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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