[PATCH] spi: remove return in spi_unregister_driver()
Make the spi_unregister_driver() code fit in with the rest of the header file, and only do the action if the driver passed is non-NULL. This also makes the code a line smaller. Signed-off-by: NBen Dooks <ben-linux@fluff.org> Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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