skal 878b9da5bf fix missed optim
it's not often the case, but could happen, that chroma has non-zero
coeff but luma hasn't. In such case, we should skip luma right away

Change-Id: I9515573ffaec8aad8b069d2c02ffbda4a6eff97c
2013-04-25 22:46:12 +02:00
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