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[9.20] fix: dev: Check if logconfig is NULL before using it in isc_log_doit()

bind-team-rw-api-rw-repo requested to merge backport-4842-shutdown-crash-in-isc_log_doit-9.20 into bind-9.20

Check if 'lctx->logconfig' is NULL before using it in isc_log_doit(), because it's possible that isc_log_destroy() was already called, e.g. when a 'call_rcu' function wants to log a message during shutdown.

Closes #4842 (closed)

Backport of MR !9297 (merged)

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