Clean up in vp9_rd_pick_inter_mode_sb

Use local variable.

Change-Id: I0d3df36cf4536958a0cda422f6c30da50f0e0bbf

vp9/encoder/vp9_rdopt.c

@@ -3355,24 +3355,25 @@ void vp9_rd_pick_inter_mode_sb(VP9_COMP *cpi,
     }
 
     if (!disable_skip) {
-      vpx_prob skip_prob = vp9_get_skip_prob(cm, xd);
+      const vpx_prob skip_prob = vp9_get_skip_prob(cm, xd);
+      const int skip_cost0 = vp9_cost_bit(skip_prob, 0);
+      const int skip_cost1 = vp9_cost_bit(skip_prob, 1);
+
       if (skippable) {
         // Back out the coefficient coding costs
         rate2 -= (rate_y + rate_uv);
 
         // Cost the skip mb case
-        rate2 += vp9_cost_bit(skip_prob, 1);
+        rate2 += skip_cost1;
       } else if (ref_frame != INTRA_FRAME && !xd->lossless) {
         if (RDCOST(x->rdmult, x->rddiv,
-                   rate_y + rate_uv + vp9_cost_bit(skip_prob, 0),
-                   distortion2) <
-            RDCOST(x->rdmult, x->rddiv,
-                   vp9_cost_bit(skip_prob, 1), total_sse)) {
+                   rate_y + rate_uv + skip_cost0, distortion2) <
+            RDCOST(x->rdmult, x->rddiv, skip_cost1, total_sse)) {
           // Add in the cost of the no skip flag.
-          rate2 += vp9_cost_bit(vp9_get_skip_prob(cm, xd), 0);
+          rate2 += skip_cost0;
         } else {
           // FIXME(rbultje) make this work for splitmv also
-          rate2 += vp9_cost_bit(vp9_get_skip_prob(cm, xd), 1);
+          rate2 += skip_cost1;
           distortion2 = total_sse;
           assert(total_sse >= 0);
           rate2 -= (rate_y + rate_uv);
@@ -3380,7 +3381,7 @@ void vp9_rd_pick_inter_mode_sb(VP9_COMP *cpi,
         }
       } else {
         // Add in the cost of the no skip flag.
-        rate2 += vp9_cost_bit(vp9_get_skip_prob(cm, xd), 0);
+        rate2 += skip_cost0;
       }
 
       // Calculate the final RD estimate for this mode.