pinctrl: uniphier: fix WARN_ON() of pingroups dump on LD20
commit 1bd303dc upstream. The pingroups dump of debugfs hits WARN_ON() in pinctrl_groups_show(). Filling non-existing ports with '-1' turned out a bad idea. Fixes: 336306ee ("pinctrl: uniphier: add UniPhier PH1-LD20 pinctrl driver") Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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