Description of problem:
  At shutdown, there are two successive attempts to shutdown the xDSL
interface.  The first succeeds and the second fails (since the
interface is already down).

Version-Release number of selected component (if applicable):
initscripts-7.42.2-1

How reproducible:
sometimes

Steps to Reproduce:
1.  Make sure xDSL interface is up.
2.  Logout, and then from the login screen, do a shutdown.  It's
necessary to shut down this way since a direct shutdown usually
doesn't let one see the shutdown messages.
  
Actual results:
  About half the time, there will be two successive shutdown attempts
for the xDSL interface.  The first succeeds and the second fails,
since the interface is already down.

Expected results:
  There should be exactly one successful shutdown attempt for the xDSL
interface.

Additional info:
  It appears that the fix for bug #109601 does more than one shutdown
attempt for the xDSL interface, and relies on an error code on the
second attempt to determine whether the interface is already down. 
Obviously this error code is not reliable.  A more elegant approach is
to make a list of interfaces to be brought down, in the correct order,
and attempt to shut each one down just once.  The bug is not a big
deal, except that any spurious error message may send people on a wild
goose chase when trying to track down other problems.  I noted this
problem in bug #109601, but it was not acted on, so I've filed a
separate bug report.