staging: comedi: amplc_pci224: fix the ao cmd->start_arg use
This driver supports two cmd->start_src values, TRIG_INT and TRIG_EXT. For
TRIG_INT sources, the cmd->start_arg is actually the valid trig_num that is
passed to the async (*inttrig) callback. This driver trivially validates the
arg for this source to be 0.
Refactor the (*inttrig) so that the cmd->start_arg is used to check the trig_num
instead of the open coded value.
For aesthetics, refactor the (*do_cmd) to use if/else instead of the switch when
handling the cmd->start_src. All code paths do the spin lock/unlock so move those
out of the if/else.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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