leak-795988: make environment data self-describing
leak-795988: make environment data self-describing

42 was somewhat cryptic (it was just something other than nothing) so
replace this with something more self describing.
See also https://bugzilla.mozilla.org/show_bug.cgi?id=795988#c15

Signed-off-by: Joe Walker <7a17872fbb32c7d760c9a16ee3076daead11efcf@mozilla.com>
joewalker/gcli,joewalker/gcli,mozilla/gcli,mozilla/gcli,mozilla/gcli