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We include workqueue.h twice.  It's unnecessary, so just remove them.

Link: http://lkml.kernel.org/r/20181126143710.31409-1-tiny.windzz@gmail.comSigned-off-by: Yangtao Li <tiny.windzz@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>