This fixes a regression introduced in revision r9466. Before this patch one might see "I/O MUX failed: Success" messages on the Asterisk console since the return from ioctl was > 0. Signed-off-by: Sean Bright <sean.bright@gmail.com> Acked-by: Shaun Ruffell <sruffell@digium.com> git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@9496 a0bf4364-ded3-4de4-8d8a-66a801d63aff