[pkg-fetchmail-maint] Bug#330522: fetchmail: don't hide errors in postinst

[Lars Wirzenius]

Package: fetchmail
Version: 6.2.5-18

The fetchmail postinst script contains the following:

adduser --system --ingroup nogroup --home /var/run/fetchmail \
        --shell /bin/sh --disabled-password fetchmail >/dev/null 2>&1 ||
true


If the adduser command fails, this manages to hide the fact from the
sysadmin. This is not good.