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vp9_noise_estimate: protect copy_frame w/CONFIG check

This is only used with CONFIG_VP9_TEMPORAL_DENOISING

Change-Id: I61a1814d43d71235077a2426f7bfce141677a79a

--- a/vp9/encoder/vp9_noise_estimate.c

+++ b/vp9/encoder/vp9_noise_estimate.c

@@ -66,6 +66,7 @@

     return 0;

 }

+#if CONFIG_VP9_TEMPORAL_DENOISING

 static void copy_frame(YV12_BUFFER_CONFIG * const dest,

                        const YV12_BUFFER_CONFIG * const src) {

   int r;

@@ -81,6 +82,7 @@

     srcbuf += src->y_stride;

   }

 }

+#endif  // CONFIG_VP9_TEMPORAL_DENOISING

 NOISE_LEVEL vp9_noise_estimate_extract_level(NOISE_ESTIMATE *const ne) {

   int noise_level = kLowLow;