[mythtv] Denoise3d pixel wrap bug.

[Andrew Mahone]

I've done some more testing, and the problem disappears when I compile
with -O1.  If I use -O2 or -O3, even without the extra options I would
normally use, it breaks again.  If I use -O1 and all of the options
listed as enabled by -O2...  it still works correctly.  I'm feeling more
certain that this is compiler bugginess at work.
-- 
  Andrew Mahone
  andrewmahone AT eml DOT cc

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