winhelp: fix memory leaks (found by Smatch).

[Lionel_Debroux]

"HLPFILE_UncompressLZ77_Phrases" and "HLPFILE_Uncompress_Phrases40" in
programs/winhelp/hlpfile.c get flagged by Michael Stefaniuc's
unfree-wine.pl script.

2007-12-09  Lionel Debroux <lionel_debroux at yahoo.fr>
        * programs/winhelp/hlpfile.c:
        winhelp: fix memory leaks (found by Smatch).
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