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vp9 denoiser: Derefencing pointer should be after null check.

BUG=webm:1267

Change-Id: I899fc9e8d784c6eefcbe27945c619845adb7b6f0

--- a/vp9/encoder/vp9_denoiser.c

+++ b/vp9/encoder/vp9_denoiser.c

@@ -575,10 +575,10 @@

 void vp9_denoiser_free(VP9_DENOISER *denoiser) {

   int i;

-  denoiser->frame_buffer_initialized = 0;

   if (denoiser == NULL) {

     return;

   }

+  denoiser->frame_buffer_initialized = 0;

   for (i = 0; i < MAX_REF_FRAMES; ++i) {

     vpx_free_frame_buffer(&denoiser->running_avg_y[i]);

   }