[lua] Dumper:close() will cause a segfault due later GC of the Dumper

This issue was migrated from bug 5320 in our old bug tracker.

Original bug information:

Reporter: Holger Freyther
Status: RESOLVED FIXED
Product: Wireshark
Component: TShark
OS: All
Platform: Other
Version: Git

Attachments:

foo.diff: Fix the issue

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