vp9_encoder_parms_get_to_decoder: add missing initializers

+ quiet an unused parameter warning

Change-Id: I65f69172febb4e0701d3e440b7e1fb31829cda57
diff --git a/test/test_vector_test.cc b/test/test_vector_test.cc
index 6f0cbdf..f1aa4d7 100644
--- a/test/test_vector_test.cc
+++ b/test/test_vector_test.cc
@@ -103,7 +103,7 @@
   const int mode = std::tr1::get<kDecodeMode>(input);
   libvpx_test::CompressedVideoSource *video = NULL;
   vpx_codec_flags_t flags = 0;
-  vpx_codec_dec_cfg_t cfg = {0};
+  vpx_codec_dec_cfg_t cfg = vpx_codec_dec_cfg_t();
   char str[256];
 
   if (mode == kFrameParallelMode) {