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vp8_rd_pick_inter_mode: clear static analysis warning

uv_intra_rate is undefined by default, it is safe to use if
uv_intra_done is true.

BUG=webm:1616

Change-Id: I02e5f6c9e5cc6ed0b41619b4a59e55ea398bad41

--- a/vp8/encoder/rdopt.c

+++ b/vp8/encoder/rdopt.c

@@ -1944,6 +1944,7 @@

         rd.distortion2 += distortion;

         if (tmp_rd < best_mode.yrd) {

+          assert(uv_intra_done);

           rd.rate2 += uv_intra_rate;

           rd.rate_uv = uv_intra_rate_tokenonly;

           rd.distortion2 += uv_intra_distortion;

@@ -2004,6 +2005,7 @@

         rd.distortion2 += distortion;

         rd.rate2 += x->mbmode_cost[x->e_mbd.frame_type]

                                   [x->e_mbd.mode_info_context->mbmi.mode];

+        assert(uv_intra_done);

         rd.rate2 += uv_intra_rate;

         rd.rate_uv = uv_intra_rate_tokenonly;

         rd.distortion2 += uv_intra_distortion;