4a4da573dd
Use intfs_shutdown() and intfs_restart() to cleanly shut down multiple
interfaces that may loop back to the same object.
This fixes a regression introduced by commit daa8ed9 ("[interface]
Provide intf_reinit() to reinitialise nullified interfaces") which
broke the use of HTTP Basic and Digest authentication.
Reported-by: murmansk <murmansk@hotmail.com>
Reported-by: Brett Waldo <brettwaldo@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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