commit c3fea428aed919826130ef8ebdb2cceb445a845b
 Author: Keith Packard <keithp@keithp.com>
 Date:   Tue May 24 20:51:31 2016 -0700

    os: Use NotifyFd for ErrorConnMax

    Instead of open-coding a single FD wait, use NotifyFd to wait for the
    FD to become readable before returning the error message.
Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Backported-to-NX-by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>