staging: comedi: ni_mio_common: remove deadcode in ni_ai_insn_config()

The previous mask by 0xf ensures that calib_source will not be > 0xf.
Remove the dead code.

Reported by: coverity
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>
1 file changed