Remove unused variable in handle_inter_mode

Change-Id: Id757d2c940756ce1b0ead2ea24af9ac0a493de05

vp9/encoder/vp9_rdopt.c

@@ -2145,7 +2145,6 @@ static int64_t handle_inter_mode(VP9_COMP *cpi, MACROBLOCK *x,
   int refs[2] = { mbmi->ref_frame[0],
     (mbmi->ref_frame[1] < 0 ? 0 : mbmi->ref_frame[1]) };
   int_mv cur_mv[2];
-  int64_t this_rd = 0;
   DECLARE_ALIGNED_ARRAY(16, uint8_t, tmp_buf, MAX_MB_PLANE * 64 * 64);
   int pred_exists = 0;
   int intpel_mv;
@@ -2449,7 +2448,7 @@ static int64_t handle_inter_mode(VP9_COMP *cpi, MACROBLOCK *x,
     single_skippable[this_mode][refs[0]] = *skippable;
 
   restore_dst_buf(xd, orig_dst, orig_dst_stride);
-  return this_rd;  // if 0, this will be re-calculated by caller
+  return 0;  // The rate-distortion cost will be re-calculated by caller.
 }
 
 void vp9_rd_pick_intra_mode_sb(VP9_COMP *cpi, MACROBLOCK *x,