Remove redundant MB_MODE_INFO reset from vp9_pick_mode_inter

Change-Id: I0222f7abc61202f4a83b117bbfb042ada6304562

vp9/encoder/vp9_pickmode.c

@@ -601,7 +601,6 @@ void vp9_pick_inter_mode(VP9_COMP *cpi, MACROBLOCK *x,
   vp9_rd_cost_reset(&best_rdc);
   vp9_rd_cost_reset(&this_rdc);
   vp9_rd_cost_reset(rd_cost);
-  vpx_memset(mbmi, 0, sizeof(MB_MODE_INFO));
   mbmi->sb_type = bsize;
   mbmi->ref_frame[0] = NONE;
   mbmi->ref_frame[1] = NONE;