some cleanup of last patch for BUG #2342

mysql-test/t/bdb-crash.test:
  added newline
sql/ha_berkeley.cc:
  added a commet

sql/ha_berkeley.cc

@@ -2101,6 +2101,15 @@ int ha_berkeley::analyze(THD* thd, HA_CHECK_OPT* check_opt)
   uint i;
   DB_TXN_STAT *txn_stat_ptr= 0;
 
+  /*
+   Original bdb documentation says:
+   "The DB->stat method cannot be transaction-protected.
+   For this reason, it should be called in a thread of
+   control that has no open cursors or active transactions."
+   So, let's check if there are any changes have been done since
+   the beginning of the transaction..
+  */
+
   /*
     If it's a merge conflict here (4.0->4.1), please ignore it!