comedi: das08_isa: Add sanity checks for I/O base address

comedi: das08_isa: Add sanity checks for I/O base address

The "das08_isa" driver uses an admin-supplied configuration option
(`it->options[0]`) to configure the I/O port base address of a supported
board in the DAS08 family.  It currently allows any base address to be
configured but the hardware only supports base addresses (configured by
an on-board DIP switch) in the range 0 to 0x3f0 on 16-byte boundaries.
(Technically, the DIP switches allow 8-byte boundaries, but I do not
think that is advisable given that the boards decode an 16-byte address
range.)

Add a sanity check to ensure the device is not configured at an
unsupported base address.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://patch.msgid.link/20260130170416.49994-13-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>