pinctrl: axp209: Fix NULL pointer dereference after allocation
There is no check that allocation in axp20x_funcs_groups_from_mask is successful. The patch adds corresponding check and return values. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Anton Vasilyev <vasilyev@ispras.ru> Acked-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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