comedi: comedi_bond: Fix leak of opened device references

bonding_attach() calls do_dev_config() to open other comedi devices
specified by the user and tries to make use of them as part of the
'bonding' device.  If it successfully opens the other device but cannot
use it (either because it does not any subdevices of a type the
'bonding' device can use, or because of some error that occurs while
dealing with its subdevices) then it is left in the open state and the
fact that it is open does not get recorded by the 'bonding' device, so
the reference to the opened device gets lost.  Fix it by closing the
opened device if it could not be bound to the 'bonding' device.

To match previous behavior, if the opened device is unsuitable then
ignore it (after closing it).  The opened devices recorded by the
'bonding' device will eventually get closed by bonding_detach() even if
bonding_attach() returns an error.

Fixes: 3cf840f65ad5 ("Staging: comedi: add comedi_bond driver")
Cc: stable <stable@kernel.org>
Reported-by: Wentao Liang <vulab@iscas.ac.cn>
Link: https://lore.kernel.org/lkml/20261103063301.1025860-1-vulab@iscas.ac.cn
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://patch.msgid.link/20261103173610.89687-1-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>