pinctrl: vt8500: wmt: Fix checking return value of pinctrl_register()
pinctrl_register() returns NULL on error. Signed-off-by:Axel Lin <axel.lin@ingics.com> Acked-by:
Tony Prisk <linux@prisktech.co.nz> Acked-by:
Linus Walleij <linus.walleij@linaro.org> Signed-off-by:
Olof Johansson <olof@lixom.net>
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