Followup to a81d930. Fix invalid expression, reported by Coverity
Followup to a81d930. Fix invalid expression, reported by Coverity

Regression introduced in a81d9304, for issue #37.

Signed-off-by: Joachim Nilsson <583c295fd7602c168ad814279bbc3894ba65f5d6@gmail.com>

troglobit/libconfuse,peda-r/libconfuse,martinh/libconfuse,westermo/libconfuse,troglobit/libconfuse,peda-r/libconfuse,martinh/libconfuse,westermo/libconfuse