MDEV-31779 Server crash in Rows_log_event::update_sequence upon replaying binary log

The crash at running mysqlbinlog on a SEQUENCE containing binlog file
was caused MDEV-29621 fixes that did not check which of the slave
or binlog applier executes a block introduced there.

The block is meaningful only for the parallel slave applier, so
it's safe to fix this bug with identified the actual applier and
skipping the block when it's the mysqlbinlog one.

mysql-test/suite/rpl/r/rpl_parallel_seq.result

@@ -127,4 +127,14 @@ CREATE SEQUENCE s4;
 DROP SEQUENCE s2,s3,s4;
 DROP TABLE ti;
 connection slave;
+connection master;
+CREATE SEQUENCE s;
+SELECT NEXTVAL(s);
+NEXTVAL(s)
+1
+flush binary logs;
+DROP SEQUENCE s;
+DROP SEQUENCE s;
+connection slave;
+connection master;
 include/rpl_end.inc

mysql-test/suite/rpl/t/rpl_parallel_seq.test

@@ -195,4 +195,22 @@ DROP TABLE ti;
 
 --sync_slave_with_master
 
+# MDEV-31779 server crash in Rows_log_event::update_sequence at replaying binlog
+--connection master
+--let $binlog_file  = query_get_value(SHOW MASTER STATUS, File, 1)
+--let $binlog_start = query_get_value(SHOW MASTER STATUS, Position, 1)
+CREATE SEQUENCE s;
+--disable_ps2_protocol
+SELECT NEXTVAL(s);
+--enable_ps2_protocol
+flush binary logs;
+DROP SEQUENCE s;
+--exec $MYSQL_BINLOG $datadir/$binlog_file | $MYSQL test
+DROP SEQUENCE s;
+
+--sync_slave_with_master
+
+--connection master
+
+
 --source include/rpl_end.inc

sql/log_event_server.cc

@@ -7544,6 +7544,7 @@ int Rows_log_event::update_sequence()
 #if defined(WITH_WSREP)
        ! WSREP(thd) &&
 #endif
+       table->in_use->rgi_slave &&
        !(table->in_use->rgi_slave->gtid_ev_flags2 & Gtid_log_event::FL_DDL) &&
        !(old_master=
          rpl_master_has_bug(thd->rgi_slave->rli,