The only limit for the stop_arg with a stop_src == TRIG_COUNT is that there is at
least 1 scan in order to prevent an empty acquisition. The max test is bogus.
Fix the validation.
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>