James Zern e47d9f1d07 rd_pick_inter_mode: prevent signed integer overflow
calculate the txfm_cache difference first as both values may be
INT64_MAX with the intent that they cancel each other out.

Change-Id: I214d072458e1b24f60289974e6302af1aff7b66c
2012-11-05 17:14:32 -08:00
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