linux-next: Signed-off-by missing for commit in the ext4 tree

[Stephen Rothwell]

Hi all,

Commit

  560d6b3da024 ("ext4: mballoc: fix possible NULL ptr & remove BUG_ONs from 
DOUBLE_CHECK")

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

-- 
Cheers,
Stephen Rothwell

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