Simplify buffer management for self-guided restoration filter
* Remove some unused variables * Reduce need for casts by typing intermediate buffers appropriately * Avoid copying data which is never modified; use the original data instead. * Reduce number of intermediate buffers required, saving allocations of 576KiB in the decoder and ~1MiB in the encoder No effect on performance Change-Id: I55243904dd8e818fb6d43fa431903736475d23ff
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