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

[Stephen Rothwell]

Hi all,

Commits

  19d8ab40f89b ("perf test stat+shadow_stat.sh: Add threshold for rounding errors")
  0c4ded92280b ("perf test lock_contention.sh: Skip test if the number of CPUs is low")

are missing a Signed-off-by from their author.

-- 
Cheers,
Stephen Rothwell

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