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

[Stephen Rothwell]

Hi all,

Commit

  771d940f4a86 ("Revert "dm: set the correct discard_sectors limit"")

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

Reverts are commits as well and so should have SOBs and explanatory
commit messages.

-- 
Cheers,
Stephen Rothwell

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