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vp9_rdopt.c: cleanup -wextra warnings

Change-Id: I1f87c689cad2224181d40a7d00f5c1064ceefa4b

--- a/vp9/encoder/vp9_rdopt.c

+++ b/vp9/encoder/vp9_rdopt.c

@@ -745,7 +745,8 @@

                              int use_fast_coef_casting) {

   MACROBLOCKD *const xd = &x->e_mbd;

   const struct macroblockd_plane *const pd = &xd->plane[plane];

-  struct rdcost_block_args args = { 0 };

+  struct rdcost_block_args args;

+  vp9_zero(args);

   args.x = x;

   args.best_rd = ref_best_rd;

   args.use_fast_coef_costing = use_fast_coef_casting;

@@ -2311,7 +2312,7 @@

   MACROBLOCKD *xd = &x->e_mbd;

   const VP9_COMMON *cm = &cpi->common;

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

-  struct buf_2d backup_yv12[MAX_MB_PLANE] = {{0}};

+  struct buf_2d backup_yv12[MAX_MB_PLANE] = {{0, 0}};

   int bestsme = INT_MAX;

   int step_param;

   int sadpb = x->sadperbit16;

@@ -3067,7 +3068,7 @@

   int64_t best_pred_rd[REFERENCE_MODES];

   int64_t best_filter_rd[SWITCHABLE_FILTER_CONTEXTS];

   int64_t best_filter_diff[SWITCHABLE_FILTER_CONTEXTS];

-  MB_MODE_INFO best_mbmode = { 0 };

+  MB_MODE_INFO best_mbmode;

   int mode_index, best_mode_index = -1;

   unsigned int ref_costs_single[MAX_REF_FRAMES], ref_costs_comp[MAX_REF_FRAMES];

   vp9_prob comp_mode_p;

@@ -3093,7 +3094,7 @@

   const int intra_y_mode_mask =

       cpi->sf.intra_y_mode_mask[max_txsize_lookup[bsize]];

   int disable_inter_mode_mask = cpi->sf.disable_inter_mode_mask[bsize];

-

+  vp9_zero(best_mbmode);

   x->skip_encode = cpi->sf.skip_encode_frame && x->q_index < QIDX_SKIP_THRESH;

   estimate_ref_frame_costs(cm, xd, segment_id, ref_costs_single, ref_costs_comp,

@@ -3676,7 +3677,7 @@

   int64_t best_pred_rd[REFERENCE_MODES];

   int64_t best_filter_rd[SWITCHABLE_FILTER_CONTEXTS];

   int64_t best_filter_diff[SWITCHABLE_FILTER_CONTEXTS];

-  MB_MODE_INFO best_mbmode = { 0 };

+  MB_MODE_INFO best_mbmode;

   int ref_index, best_ref_index = 0;

   unsigned int ref_costs_single[MAX_REF_FRAMES], ref_costs_comp[MAX_REF_FRAMES];

   vp9_prob comp_mode_p;

@@ -3696,6 +3697,7 @@

   x->skip_encode = cpi->sf.skip_encode_frame && x->q_index < QIDX_SKIP_THRESH;

   vpx_memset(x->zcoeff_blk[TX_4X4], 0, 4);

+  vp9_zero(best_mbmode);

   for (i = 0; i < 4; i++) {

     int j;