Fix denoiser chroma component initialization

Use the correct frame size and stride value for chroma components
when setting the initial values. These control parameters are
assigned when the denoiser buffer was allocated and initialized.

Change-Id: Ia6318194c7738aff540bcbd34f77f0dac46221a1

vp9/encoder/vp9_denoiser.c

diff --git a/vp9/encoder/vp9_denoiser.c b/vp9/encoder/vp9_denoiser.c
index e0ebb77..2266a26 100644
--- a/vp9/encoder/vp9_denoiser.c
+++ b/vp9/encoder/vp9_denoiser.c
@@ -485,15 +485,13 @@
   uint8_t *u = yuv->u_buffer;
   uint8_t *v = yuv->v_buffer;
 
-  // The '/2's are there because we have a 440 buffer, but we want to output
-  // 420.
-  for (r = 0; r < yuv->uv_height / 2; ++r) {
-    for (c = 0; c < yuv->uv_width / 2; ++c) {
+  for (r = 0; r < yuv->uv_height; ++r) {
+    for (c = 0; c < yuv->uv_width; ++c) {
       u[c] = UINT8_MAX / 2;
       v[c] = UINT8_MAX / 2;
     }
-    u += yuv->uv_stride + yuv->uv_width / 2;
-    v += yuv->uv_stride + yuv->uv_width / 2;
+    u += yuv->uv_stride;
+    v += yuv->uv_stride;
   }
 }
 #endif