[Patch] fix small memleak in _dbus_setenv()

[Christian Ehrlicher]

Hi,

this patch fixes a small memleak on systems where (un)setenv() is not 
available and therefore emulated through putenv().
The patch is against 1.2.1


Christian

btw: http://www.freedesktop.org/wiki/Software/dbus claims that 1.1.20 is 
the latest dbus version
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