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vp9_decodeframe.c: cleanup -wextra warnings

Change-Id: I0315cea6a5e58182bc2556e9825ec2ef0b1480c3

--- a/vp9/common/vp9_common.h

+++ b/vp9/common/vp9_common.h

@@ -45,7 +45,7 @@

     vpx_memcpy(dest, src, n * sizeof(*src)); \

   }

-#define vp9_zero(dest) vpx_memset(&dest, 0, sizeof(dest))

+#define vp9_zero(dest) vpx_memset(&(dest), 0, sizeof(dest))

 #define vp9_zero_array(dest, n) vpx_memset(dest, 0, n * sizeof(*dest))

 static INLINE uint8_t clip_pixel(int val) {

--- a/vp9/decoder/vp9_decodeframe.c

+++ b/vp9/decoder/vp9_decodeframe.c

@@ -1279,6 +1279,7 @@

     const uint8_t *data,

     const uint8_t *data_end,

     uint8_t *clear_data /* buffer size MAX_VP9_HEADER_SIZE */) {

+  vp9_zero(*rb);

   rb->bit_offset = 0;

   rb->error_handler = error_handler;

   rb->error_handler_data = &pbi->common;

@@ -1299,7 +1300,7 @@

                      const uint8_t **p_data_end) {

   VP9_COMMON *const cm = &pbi->common;

   MACROBLOCKD *const xd = &pbi->mb;

-  struct vp9_read_bit_buffer rb = { 0 };

+  struct vp9_read_bit_buffer rb;

   uint8_t clear_data[MAX_VP9_HEADER_SIZE];

   const size_t first_partition_size = read_uncompressed_header(pbi,

       init_read_bit_buffer(pbi, &rb, data, data_end, clear_data));