staging: comedi: amcc_s5933.h: checkpatch.pl cleanup (space prohibited)

Fix this checkpatch.pl warning:

WARNING: space prohibited between function name and open parenthesis '('

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>