sdio: fix reference counting in sdio_remove_func()
sdio_remove_func() needs to be more careful about reference counting. It can be called in error paths where sdio_add_func() has never been called e.g. mmc_attach_sdio error path --> mmc_sdio_remove --> sdio_remove_func Signed-off-by: NDaniel Drake <dsd@laptop.org> Reviewed-by: NMatt Fleming <matt@console-pimps.org> Cc: <linux-mmc@vger.kernel.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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