staging: comedi: me4000: cleanup me4000_cnt_insn_config()

Absorb the cnt_reset and cnt_config helper functions. They are
now both just single line routines.

Remove the printk noise about "Invalid instruction length".

Fix the return value, the value should be the number of data values
used to perform the instruction. The GPCT_RESET instruction only
has one parameter.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>