staging: unisys: visorbus: chipset_init add error handling

Controlvm_respond_chipset_init now errors out correctly. Pass the errors
back up to the stack to be processed.

Signed-off-by: David Kershner <david.kershner@unisys.com>
Reported-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>