spice: do not show error on cancel/close of auth dialog
Mainly an issue for kiosk mode due the fact that it'll not quit the
application on cancel. That means that authentication dialog can't
really be canceled and showing an input error such as "wrong password"
is misleading (no password should be taken in consideration on Cancel).
Related: https://bugzilla.redhat.com/show_bug.cgi?id=1446161
Signed-off-by: Victor Toso <victortoso@redhat.com>
Acked-by: Pavel Grunt <pgrunt@redhat.com>
Acked-by: Eduardo Lima (Etrunko) <etrunko@redhat.com>