staging: unisys: visorbus: use guid_is_equal instead of memcmp

The function publish_vbus_dev_info was doing a memcmp of guids. It should
be using the kernel provided guid_equal function instead.

Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Tim Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>