kthread: make __kthread_queue_delayed_work static
The __kthread_queue_delayed_work is not exported so make it static, to avoid the following sparse warning: kernel/kthread.c:869:6: warning: symbol '__kthread_queue_delayed_work' was not declared. Should it be static? Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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