vp8 denoiser fix: free memory of denoiser->denoiser_state.

Change has been committed upstream:
https://gerrit.chromium.org/gerrit/#/c/70675/

BUG=https://code.google.com/p/webrtc/issues/detail?id=3524
R=johannkoenig@google.com, ronghuawu@chromium.org
TBR=tomfinegan@chromium.org

Review URL: https://codereview.chromium.org/360053005

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/libvpx@280676 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
diff --git a/source/libvpx/vp8/encoder/denoising.c b/source/libvpx/vp8/encoder/denoising.c
index 0f2e5f1..9206b94 100644
--- a/source/libvpx/vp8/encoder/denoising.c
+++ b/source/libvpx/vp8/encoder/denoising.c
@@ -241,6 +241,7 @@
         vp8_yv12_de_alloc_frame_buffer(&denoiser->yv12_running_avg[i]);
     }
     vp8_yv12_de_alloc_frame_buffer(&denoiser->yv12_mc_running_avg);
+    vpx_free(denoiser->denoise_state);
 }