After the conversion to devm_pinctrl_register, we get a warning in
sh_pfc_remove when CONFIG_PINCTRL_SH_PFC_GPIO is disabled:
drivers/pinctrl/sh-pfc/core.c: In function 'sh_pfc_remove':
drivers/pinctrl/sh-pfc/core.c:603:17: unused variable 'pfc' [-Werror=unused-variable]
struct sh_pfc *pfc = platform_get_drvdata(pdev);
This moves the variable definition inside of the same ifdef
that has the only user, to get a clean build again.