staging: comedi: ni_tio: absorb ni_tio_counter_status()

This function is only called to handle the INSN_CONFIG_GET_COUNTER_STATUS
instruction. For aesthetics, absorb the code into ni_tio_insn_config().

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>