Refactor Remove extra logics in check_best_zero_mv
Refactor Remove extra logics in check_best_zero_mv

Change-Id: I3a2f0fd2d298a38e50892aa89e258dd15df3ece1

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom