comedi vmk80xx: Style improvements

Style improvements to comedi driver vmk80xx:
 * One variable definition per line
 * Block quotes start and end with near-empty lines
 * If..else statements use braces for both branches
 * Egregious blank lines removed
 * Use if..else rather than goto where trivial
 * Don't put function return type on a separate line

Signed-off-by: J. Ali Harlow <ali@avrc.city.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>