staging: vboxvideo: Remove unnecessary parentheses

Remove unneeded parentheses around the arguments of ||. This reduces
clutter and code behave in the same way.
Change suggested by checkpatch.pl.

vbox_main.c:119: CHECK: Unnecessary parentheses around 'rects[i].x2 <
crtc->x'

Signed-off-by: Shayenne da Luz Moura <shayenneluzmoura@gmail.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>