vp10/rdopt: quiet unused variable warning

when CONFIG_REF_MV and CONFIG_EXT_INTER are enabled

Change-Id: I17fa2b5fe0e1878333099cc5fa2b1ee36636b4d3

vp10/encoder/rdopt.c

diff --git a/vp10/encoder/rdopt.c b/vp10/encoder/rdopt.c
index 3eeb1f3..6ffa790c 100644
--- a/vp10/encoder/rdopt.c
+++ b/vp10/encoder/rdopt.c
@@ -8876,7 +8876,6 @@
       else if (best_mbmode.mv[0].as_int == 0)
         best_mbmode.mode = ZEROMV;
     } else {
-      int i;
       int_mv nearestmv[2] = { frame_mv[NEARESTMV][refs[0]],
                               frame_mv[NEARESTMV][refs[1]] };
       int_mv nearmv[2] = { frame_mv[NEARMV][refs[0]],
@@ -8888,6 +8887,7 @@
          nearmv[1] = mbmi_ext->ref_mv_stack[rf_type][1].comp_mv;
        }
 #else
+      int i;
       int ref_set = (mbmi_ext->ref_mv_count[rf_type] >= 2) ?
           VPXMIN(2, mbmi_ext->ref_mv_count[rf_type] - 2) : INT_MAX;