Correct a couple of typos

Change-Id: Ic470c6c9ce27b615c9645b9cb0d67526417bc374

vp9/decoder/vp9_decodframe.c

@@ -891,8 +891,8 @@ static const uint8_t *decode_tiles(VP9D_COMP *pbi, const uint8_t *data) {
   const uint8_t *end = NULL;
   vp9_reader r;
 
-  assert(tile_rows < 4);
-  assert(tile_cols < (1 << 6));
+  assert(tile_rows <= 4);
+  assert(tile_cols <= (1 << 6));
 
   // Note: this memset assumes above_context[0], [1] and [2]
   // are allocated as part of the same buffer.

vp9/encoder/vp9_bitstream.c

@@ -1217,7 +1217,7 @@ static size_t encode_tiles(VP9_COMP *cpi, uint8_t *data_ptr) {
     for (tile_col = 0; tile_col < tile_cols; tile_col++) {
       TileInfo tile;
 
-      vp9_tile_init(&tile, cm, 0, tile_col);
+      vp9_tile_init(&tile, cm, tile_row, tile_col);
       tok_end = tok[tile_row][tile_col] + cpi->tok_count[tile_row][tile_col];
 
       if (tile_col < tile_cols - 1 || tile_row < tile_rows - 1)