#3234 log: memleak detected by valgrind

[Thuan Tran]

==225== 1,152 (64 direct, 1,088 indirect) bytes in 1 blocks are definitely lost in loss record 166 of 178
==225==    at 0x4C31B25: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==225==    by 0x5AFF4A6: ncs_edu_compile_edp (hj_edu.c:3763)
==225==    by 0x5B0055D: ncs_edu_run_edp (hj_edu.c:452)
==225==    by 0x5B00DD1: ncs_edu_perform_enc_op (hj_edu.c:3399)
==225==    by 0x5B00FCA: ncs_edu_ver_exec (hj_edu.c:237)
==225==    by 0x140D64: ckpt_encode_async_update (lgs_mbcsv.cc:1067)
==225==    by 0x140D64: ckpt_encode_cbk_handler (lgs_mbcsv.cc:692)
==225==    by 0x140D64: mbcsv_callback(ncs_mbcsv_cb_arg*) (lgs_mbcsv.cc:632)
==225==    by 0x5B23CEC: mbcsv_send_ckpt_data_to_all_peers (mbcsv_util.c:442)
==225==    by 0x5B1CF63: mbcsv_process_snd_ckpt_request (mbcsv_api.c:846)
==225==    by 0x13F7D1: lgs_ckpt_send_async(lgs_cb*, void*, unsigned int) (lgs_mbcsv.cc:2899)
==225==    by 0x13FB4F: lgs_ckpt_log_async(log_stream*, char*) (lgs_mbcsv.cc:3316)
==225==    by 0x15DA39: Cache::Data::SyncWriteWithStandby() const (lgs_cache.cc:247)
==225==    by 0x15E263: Cache::PostWrite(std::shared_ptr<Cache::Data>) (lgs_cache.cc:413)

[Thuan Tran]

commit a66c5a5329494a91227e06b61547506d4dcaad4b (HEAD -> develop, origin/develop)
Author: thuan.tran thuan.tran@dektech.com.au
Date: Tue Nov 10 15:23:27 2020 +0700

log: fix memleak detected by valgrind [#3234]