[PATCH] for bug 6249699 PAM may access pointers after free()

* Fixed double free call (though it was pedantic, the second free case
checked the variable before freeing)

* Leveraged free_env for consistency instead of doing the exact same
things ourselves


Shawn Walker, Software and Systems Analyst
binarycrusader at gmail.com - http://binarycrusader.blogspot.com/

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