Memory leaks in plugin code

➜  ~ sudo cat /core/asan.mariadb.1573454 | grep 'Direct leak' | wc -l 

118

➜  ~ sudo tail /core/asan.mariadb.1573454                             

    #13 0x6320ea6bb62b in mysql_execute_command(THD*, bool) /home/ubuntu/proj/MariaDBEnterprise/sql/sql_parse.cc:4546

    #14 0x6320ea6c7441 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /home/ubuntu/proj/MariaDBEnterprise/sql/sql_parse.cc:8173

    #15 0x6320ea6cbd01 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool) /home/ubuntu/proj/MariaDBEnterprise/sql/sql_parse.cc:1903

    #16 0x6320ea6d25a2 in do_command(THD*, bool) /home/ubuntu/proj/MariaDBEnterprise/sql/sql_parse.cc:1416

    #17 0x6320eabbe668 in do_handle_one_connection(CONNECT*, bool) /home/ubuntu/proj/MariaDBEnterprise/sql/sql_connect.cc:1415

    #18 0x6320eabbee5c in handle_one_connection /home/ubuntu/proj/MariaDBEnterprise/sql/sql_connect.cc:1317

    #19 0x6320eb9ec4fe in pfs_spawn_thread /home/ubuntu/proj/MariaDBEnterprise/storage/perfschema/pfs.cc:2201

    #20 0x72b6f825e109 in asan_thread_start ../../../../src/libsanitizer/asan/asan_interceptors.cpp:234

SUMMARY: AddressSanitizer: 26354681 byte(s) leaked in 70362 allocation(s).