Memory leak after 'innodb.log_encrypt_1_rk' - in 'redo_log_keys::load_latest_key()'

./mysql-test/mtr --big-test --debug-server --sanitize innodb.log_encrypt_1_rk

[ 50%] innodb.log_encrypt_1_rk                  [ pass ]  16781
worker[1] Sanitizer report from /home/yura/addon/local/percona-build-5.7-asan_gcc8/mysql-test/var/log/mysqld.1.err after tests:
 innodb.log_encrypt_1_rk
--------------------------------------------------------------------------
==34956==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 66 byte(s) in 1 object(s) allocated from:
    #0 0x7f15420edf00 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.5+0xedf00)
    #1 0x5619f2e47d1a in my_raw_malloc /home/yura/addon/local/percona-server/mysys/my_malloc.c:191
    #2 0x5619f2e47d1a in my_malloc /home/yura/addon/local/percona-server/mysys/my_malloc.c:54
    #3 0x7f153837dc15  (<unknown module>)
    #4 0x7f153837e60d  (<unknown module>)
    #5 0x7f153839324d  (<unknown module>)
    #6 0x7f15383982f8  (<unknown module>)
    #7 0x7f1538395367  (<unknown module>)
    #8 0x5619f28b8b05 in key_fetch /home/yura/addon/local/percona-server/sql/keyring_service.cc:49
    #9 0x5619f2475779 in plugin_foreach_with_mask(THD*, char (**)(THD*, st_plugin_int**, void*), int, unsigned int, void*) /home/yura/addon/local/percona-server/sql/sql_plugin.cc:2573
    #10 0x5619f24759eb in plugin_foreach_with_mask(THD*, char (*)(THD*, st_plugin_int**, void*), int, unsigned int, void*) /home/yura/addon/local/percona-server/sql/sql_plugin.cc:2588
    #11 0x5619f28b9496 in my_key_fetch /home/yura/addon/local/percona-server/sql/keyring_service.cc:117
    #12 0x5619f38da526 in redo_log_keys::load_latest_key(THD*, bool) /home/yura/addon/local/percona-server/storage/innobase/fil/fil0crypt.cc:3176
    #13 0x5619f31e922a in log_rotate_default_key() /home/yura/addon/local/percona-server/storage/innobase/log/log0log.cc:1421
    #14 0x5619f30613b2 in innobase_fix_tablespaces_empty_uuid() /home/yura/addon/local/percona-server/storage/innobase/handler/ha_innodb.cc:3948
    #15 0x5619f274e501 in mysqld_main(int, char**) /home/yura/addon/local/percona-server/sql/mysqld.cc:5159
    #16 0x5619f108675d in main /home/yura/addon/local/percona-server/sql/main.cc:25
    #17 0x7f153fd0cb96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)