Possible memory leak

[Steven Smith]

There seems to be a small memory leak in _nc_read_entry_source in
version 5.4 of ncurses.

In particular, _nc_read_entry_source calls _nc_parse_entry, which in
turn calls _nc_init_entry, but the memory allocated there doesn't
appear to get freed anywhere.  enqueue() copies the structure, rather
than making a new reference to it.

I attach a patch which appears to fix the problem, but it's rather
ugly.

Steven Smith.

ncurses.diff
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