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[9.18] named-rrchecker: have fatal cleanup

Mark Andrews requested to merge 3838-named-rrchecker-should-cleanup-when-it-detects-an-error-v9_18 into v9_18

Backport of MR !7473 (merged)

It is trivial to fully cleanup memory on all the error paths in named-rrchecker, many of which are triggered by bad user input. This involves freeing lex and mctx if they exist when fatal is called.

(cherry picked from commit dbe82813)

Closes #3838 (closed)

Edited by Mark Andrews

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