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mips dsp-ase r2 vp9 decoder fixed bug in extend frame module (seg fault)

Change-Id: Ic46da8897d2fb5351e22d6d74805fd9d78c81b32

--- a/vpx_scale/mips/dspr2/yv12extend_dspr2.c

+++ b/vpx_scale/mips/dspr2/yv12extend_dspr2.c

@@ -107,14 +107,13 @@

 static void extend_frame(YV12_BUFFER_CONFIG *const ybf,

                          int subsampling_x, int subsampling_y,

                          int ext_size) {

-  const int c_w = (ybf->y_crop_width + subsampling_x) >> subsampling_x;

-  const int c_h = (ybf->y_crop_height + subsampling_y) >> subsampling_y;

-  const int c_et = ext_size >> subsampling_y;

-  const int c_el = ext_size >> subsampling_x;

-  const int c_eb = (ext_size + ybf->y_height - ybf->y_crop_height +

-                    subsampling_y) >> subsampling_y;

-  const int c_er = (ext_size + ybf->y_width - ybf->y_crop_width +

-                    subsampling_x) >> subsampling_x;

+  const int c_w = ybf->uv_crop_width;

+  const int c_h = ybf->uv_crop_height;

+  const int c_ext_size = ext_size >> 1;

+  const int c_et = c_ext_size;

+  const int c_el = c_ext_size;

+  const int c_eb = c_ext_size + ybf->uv_height - ybf->uv_crop_height;

+  const int c_er = c_ext_size + ybf->uv_width - ybf->uv_crop_width;

   assert(ybf->y_height - ybf->y_crop_height < 16);

   assert(ybf->y_width - ybf->y_crop_width < 16);