[patch] Fix BZ #18043 (comment #19)

[Mike Frysinger]

On 09 Mar 2015 16:13, Paul Pluzhnikov wrote:
> Calling 'setenv(..., NULL, 1)' invokes undefined behavior.
> 
> Unfortunately, wordexp() itself does it, triggering subsequent buffer overflow.
> See http://sourceware.org/bugzilla/show_bug.cgi?id=18043#c19.
> 
> Attached trivial patch stops wordexp from doing that.

lgtm
-mike
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