Staging: vt6655: Checkpatch fix: unnecessary whitespace

This patch fixes the following checkpatch.pl errors in mac.h:
ERROR: space prohibited before that ',' (ctx:WxW)

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