media: mtk-vcodec: fix access to vb2_v4l2_buffer struct

Commit 0650a91 ("media: mtk-vcodec: Correct return type for mem2mem
buffer helpers") fixed the return types for mem2mem buffer helper
functions, but omitted two occurrences that are accessed in the
mtk_v4l2_debug() macro. These only trigger compiler errors when DEBUG is
defined.

Fixes: 0650a91 ("media: mtk-vcodec: Correct return type for mem2mem buffer helpers")

Signed-off-by: Alexandre Courbot <acourbot@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c

@@ -1158,7 +1158,7 @@ static void vb2ops_vdec_buf_queue(struct vb2_buffer *vb)
  src_mem.size = (size_t)src_buf->planes[0].bytesused;
  mtk_v4l2_debug(2,
  "[%d] buf id=%d va=%p dma=%pad size=%zx",
- ctx->id, src_buf->index,
+ ctx->id, src_buf->vb2_buf.index,
  src_mem.va, &src_mem.dma_addr,
  src_mem.size);
 
@@ -1182,7 +1182,7 @@ static void vb2ops_vdec_buf_queue(struct vb2_buffer *vb)
  }
  mtk_v4l2_debug(ret ? 0 : 1,
  "[%d] vdec_if_decode() src_buf=%d, size=%zu, fail=%d, res_chg=%d",
- ctx->id, src_buf->index,
+ ctx->id, src_buf->vb2_buf.index,
  src_mem.size, ret, res_chg);
  return;
  }