MDEV-23832 Crash at startup in Log_event::read_log_event
The crash was caused by improper raising of an error or replication checksum verification at time of the server initialization. As there is no THD object associated with the main initializing thread yet the error text should be assigned with calling a respective macro that is aware of that possibility. Fixed accordingly. [At merging to 10.4 the new test result file needs +# restart: --master_verify_checksum=ON --debug_dbug=+d,corrupt_read_log_event_char that mtr run will hint on.]
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