bcachefs: Don't count "skipped access bit" as touched in btree cache scan

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/btree_cache.c

@@ -449,6 +449,7 @@ static unsigned long bch2_btree_cache_scan(struct shrinker *shrink,
 		if (btree_node_accessed(b)) {
 			clear_btree_node_accessed(b);
 			bc->not_freed[BCH_BTREE_CACHE_NOT_FREED_access_bit]++;
+			--touched;;
 		} else if (!btree_node_reclaim(c, b, true)) {
 			freed++;
 			btree_node_data_free(c, b);