Revert "Fix warnings: unused variable ‘plane_bsize’"

This reverts commit 9abda5913d31f92c5658afc38424a341a11faaef.

Reason for revert: This will only throw a warning on problematic configurations (CONFIG_DEBUG should not be enabled in relase)

Change-Id: I12000e9ee95b9691f233a877fca2073f3566bdb6

av1/common/reconintra.c

diff --git a/av1/common/reconintra.c b/av1/common/reconintra.c
index 6bc8b40..159e254 100644
--- a/av1/common/reconintra.c
+++ b/av1/common/reconintra.c
@@ -2280,7 +2280,6 @@
 #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

diff --git a/av1/encoder/rdopt.c b/av1/encoder/rdopt.c
index 1584202..acaadef 100644
--- a/av1/encoder/rdopt.c
+++ b/av1/encoder/rdopt.c
@@ -5163,7 +5163,6 @@
   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]);