staging: comedi: cb_pcidas64: whitespace/brace changes

Some whitespace changes, mostly to fix lines > 80 characters and
operator placement.  Add/remove some braces according to CodingStyle.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>