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vp9_rd_pick_inter_mode_sb: fix uninitialized value

'skippable' can remain unset and negatively affect later decisions

address one aspect of issue #599

Change-Id: Iffdf0ac2e49ac481c27dc27c87fa546d4167bb28

--- a/vp9/encoder/vp9_rdopt.c

+++ b/vp9/encoder/vp9_rdopt.c

@@ -3306,7 +3306,7 @@

     int compmode_cost = 0;

     int rate2 = 0, rate_y = 0, rate_uv = 0;

     int64_t distortion2 = 0, distortion_y = 0, distortion_uv = 0;

-    int skippable;

+    int skippable = 0;

     int64_t tx_cache[TX_MODES];

     int i;

     int this_skip2 = 0;

-- 

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