staging: unisys: visorbus: just check for GUID

Every channel_type must have a valid GUID, checking for the name was just
redundant.

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>