[issue18113] Memory leak in curses.panel

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> I've attached a new version of the patch that does this check, and also adds a test.

You are right. Your patch LGTM.

> (OTOH, looking at the ncurses 5.9 source code, set_panel_userptr() only returns an error if the panel object is NULL, which should never happen because Python reports an error if the panel creation fails.  So maybe the rc == ERR check is pointless.)

Future versions or alternative implementations can returns an error in other circumstances.

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