"ip addr show up" would exclude the interface (link), but include the
addresses of down interfaces (which looked like they where indented
under a different interface). This fixes the filtering.

For a full example see the original bug report at:
http://bugs.debian.org/776040Reported-by: Paul Slootman <paul@debian.org>
CC: 776040@bugs.debian.org
Signed-off-by: Andreas Henriksson <andreas@fatal.se>