MDEV-33928 : Assertion failure on wsrep_thd_is_aborting

Problem was assertion assuming we always hold
THD::LOCK_thd_data mutex that is not true.
In most cases this is true but function is
also used from InnoDB lock manager and
there we can't take THD::LOCK_thd_data to
obey mutex ordering. Removed assertion as
wsrep transaction state can't change even
that case.
Signed-off-by: Julius Goryavsky <julius.goryavsky@mariadb.com>

sql/service_wsrep.cc

-/* Copyright 2018-2023 Codership Oy <info@codership.com>
+/* Copyright 2018-2024 Codership Oy <info@codership.com>
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -283,10 +283,28 @@ extern "C" my_bool wsrep_thd_order_before(const THD *left, const THD *right)
   return FALSE;
 }
 
+/** Check if wsrep transaction is aborting state.
+
+Calling function should make sure that wsrep transaction state
+can't change during this function.
+
+This function is called from
+wsrep_abort_thd where we hold THD::LOCK_thd_data
+wsrep_handle_mdl_conflict we hold THD::LOCK_thd_data
+wsrep_assert_no_bf_bf_wait we hold lock_sys.latch
+innobase_kill_query we hold THD::LOCK_thd_data (THD::awake_no_mutex)
+
+@param thd         thread handle
+
+@return true       if wsrep transaction is aborting
+@return false      if not
+
+*/
 extern "C" my_bool wsrep_thd_is_aborting(const MYSQL_THD thd)
 {
   const wsrep::client_state& cs(thd->wsrep_cs());
   const enum wsrep::transaction::state tx_state(cs.transaction().state());
+
   switch (tx_state)
   {
     case wsrep::transaction::s_must_abort:
@@ -296,8 +314,10 @@ extern "C" my_bool wsrep_thd_is_aborting(const MYSQL_THD thd)
     case wsrep::transaction::s_aborted:
       return true;
     default:
-      return false;
+      break;
   }
+
+  return false;
 }
 
 static inline enum wsrep::key::type