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

[Stephen Rothwell]

Hi Max,

Commit

  12e90ddd8dbf ("Revert "xtensa: xtfpga: implement platform DMA address 
helpers"")

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

Reverts are commits too.

-- 
Cheers,
Stephen Rothwell

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