printk: fix failure to return error in devkmsg_poll()
Error value got overwritten instantly. Signed-off-by: Nicolas Kaiser <nikai@nikai.net> Cc: Kay Sievers <kay.sievers@vrfy.org> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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