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Improve vp9_rb_bytes_read

Change-Id: I69eba120eb3d8ec43b5552451c8a9bd009390795

--- a/vp9/decoder/vp9_read_bit_buffer.c

+++ b/vp9/decoder/vp9_read_bit_buffer.c

@@ -10,7 +10,7 @@

 #include "vp9/decoder/vp9_read_bit_buffer.h"

 size_t vp9_rb_bytes_read(struct vp9_read_bit_buffer *rb) {

-  return rb->bit_offset / CHAR_BIT + (rb->bit_offset % CHAR_BIT > 0);

+  return (rb->bit_offset + CHAR_BIT - 1) / CHAR_BIT;

 }

 int vp9_rb_read_bit(struct vp9_read_bit_buffer *rb) {