Staging: xgifb: fix bitwise vs logical bug

This is a static checker fix and not something I can test.  The intent
of the code here is to set some bit flags.  For a logical OR the ">> 1"
shift wouldn't make a difference.  So it should be using a bitwise OR.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>