Yaowu Xu 99230aeb05 Prevent reading of uninitialized value
This commit added a check of reference frame to make sure that pre
buffer pointers are initialized only when necessary and make them
to 0 if ref frame is intra, hence those buffer should never be used.

Change-Id: Ieb474fcd9feb759f02e2f9c282b7348a8fa31117
2014-04-16 13:00:13 -07:00
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