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Assign 2nd ref frame in choose_partitioning

Avoid the use of uninitialized second reference frame for fetching
reference block.

Change-Id: I9983a0daea829700b3270dc8bf2bcc6d6ea36652

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

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

@@ -528,11 +528,12 @@

   sp = x->plane[0].src.stride;

   if (cm->frame_type != KEY_FRAME) {

+    MB_MODE_INFO *mbmi = &xd->mi[0].src_mi->mbmi;

     vp9_setup_pre_planes(xd, 0, yv12, mi_row, mi_col, sf);

-

-    xd->mi[0].src_mi->mbmi.ref_frame[0] = LAST_FRAME;

-    xd->mi[0].src_mi->mbmi.sb_type = BLOCK_64X64;

-    xd->mi[0].src_mi->mbmi.mv[0].as_int = 0;

+    mbmi->ref_frame[0] = LAST_FRAME;

+    mbmi->ref_frame[1] = NONE;

+    mbmi->sb_type = BLOCK_64X64;

+    mbmi->mv[0].as_int = 0;

     vp9_build_inter_predictors_sby(xd, mi_row, mi_col, BLOCK_64X64);

     d = xd->plane[0].dst.buf;