Replace &pbi->td with td in decode_tiles().

The local variable td in decode_tiles() is set to &pbi->td, so replace
all occurrences of &pbi->td with td for consistency.

Change-Id: I3c685ba2caea3fe0c8d59e9955a2d7f6b18eabed
diff --git a/av1/decoder/decodeframe.c b/av1/decoder/decodeframe.c
index f71fbfd..c40e2cb 100644
--- a/av1/decoder/decodeframe.c
+++ b/av1/decoder/decodeframe.c
@@ -2666,8 +2666,8 @@
 
       td->xd = pbi->mb;
       td->xd.corrupted = 0;
-      td->xd.mc_buf[0] = pbi->td.mc_buf[0];
-      td->xd.mc_buf[1] = pbi->td.mc_buf[1];
+      td->xd.mc_buf[0] = td->mc_buf[0];
+      td->xd.mc_buf[1] = td->mc_buf[1];
       td->bit_reader = &tile_data->bit_reader;
       av1_zero(td->dqcoeff);
       av1_tile_init(&td->xd.tile, cm, row, col);
@@ -2690,7 +2690,7 @@
       td->xd.tile_ctx = &tile_data->tctx;
 
       // decode tile
-      decode_tile(pbi, &pbi->td, row, col);
+      decode_tile(pbi, td, row, col);
       aom_merge_corrupted_flag(&pbi->mb.corrupted, td->xd.corrupted);
       if (pbi->mb.corrupted)
         aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME,