linux-next: Signed-off-by missing for commit in the xfs tree

From: Stephen Rothwell
Date: Wed Aug 16 2017 - 17:48:14 EST

Hi all,

Commit

74456cceed0b ("iomap: fix integer truncation issues in the zeroing and dirtying helpers")

is missing a Signed-off-by from its author.

--
Cheers,
Stephen Rothwell