mfd: sm501 build fixes when CONFIG_MFD_SM501_GPIO unset
Fix the build problems if CONFIG_MFD_SM501_GPIO is not set, which is generally when there is no gpiolib support available as currently happens on x86 when building PCI SM501. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Tested-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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