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Initialize mb_skip_coeff before picking modes

It appears that the above/left mb_skip_coeff used during
the pick modes, is left over from the previously
encode frame.  This patch initializes the flag to the default
value of zero.


Change-Id: Ida4684cc99611d6e3e82628db35ed717e28ce550

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -590,7 +590,11 @@

   set_offsets(cpi, mi_row, mi_col, bsize);

   xd->mode_info_context->mbmi.sb_type = bsize;

+  // Set to zero to make sure we do not use the previous encoded frame stats

+  xd->mode_info_context->mbmi.skip_coeff = 0;

+

   x->source_variance = get_sby_perpixel_variance(cpi, x, bsize);

+

   if (cpi->oxcf.tuning == VP8_TUNE_SSIM)

     vp9_activity_masking(cpi, x);