shell32: Set pointer to NULL after free to avoid double free

[Michael Mc Donnell]

UnixSubFolderIterator_IEnumIDList_Next currently changes value
of the pointer passed in and leaves garbage in it if it fails. It
should instead either not touch the value or NULL it. Tests are
needed to show which one is the correct behavior. This patch sets
the pointer to NULL if the function fails, and thereby fixes the
double free bug 28737.
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