[sudo-workers] segfault when #include directive is used in cycles

[Daniel Kopecek]

Hi,
 there is a bug in toke.c:_push_include causing a segfault when using a deep
sudoers tree structure (#include/#includedir). After fixing this issue there
seems to be another one causing a double-free. The patch attached contains
fixes to both issues, but I'm not sure whether the double-free fix is valid.

The #include(dir) bug is described here https://bugzilla.redhat.com/show_bug.cgi?id=561336

Dan
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