Fix warnings: unused variable ‘plane_bsize’

Change-Id: I8e205e5b6310b345065200cfdac23f30badc3caa

av1/common/reconintra.c

@@ -2315,6 +2315,7 @@ void av1_predict_intra_block_facade(const AV1_COMMON *cm, MACROBLOCKD *xd,
 #if CONFIG_DEBUG
     assert(is_cfl_allowed(mbmi));
     const BLOCK_SIZE plane_bsize = get_plane_block_size(mbmi->sb_type, pd);
+    (void)plane_bsize;
     assert(plane_bsize < BLOCK_SIZES_ALL);
     if (!xd->lossless[mbmi->segment_id]) {
       assert(blk_col == 0);

av1/encoder/rdopt.c

@@ -5403,6 +5403,7 @@ static int cfl_rd_pick_alpha(MACROBLOCK *const x, const AV1_COMP *const cpi,
   assert(is_cfl_allowed(mbmi));
   const BLOCK_SIZE plane_bsize =
       get_plane_block_size(mbmi->sb_type, &xd->plane[AOM_PLANE_U]);
+  (void)plane_bsize;
   assert(plane_bsize < BLOCK_SIZES_ALL);
   if (!xd->lossless[mbmi->segment_id]) {
     assert(block_size_wide[plane_bsize] == tx_size_wide[tx_size]);