Staging: vt6655: Checkpatch fix: c99 comments after statements

This patch fixes some c99 errors in mac.h:
ERROR: do not use C99 // comments

All instances where the c99 comment occurs after a statement.

Signed-off-by: Emrys Bayliss <emrys@paradise.net.nz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>