We only set changes on the main protocol screen as, for example
in RRSetChanged() and RRTellChanged(), therefore we should follow
the same logic when reporting that an output changed in
RROutputChanged().
This means that RRTellChanged() will then update the relevant
timestamps also when events come from gpu screens.
[ajax: Fix mixed code and decls]
Reviewed-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Alberto Milone <alberto.milone@canonical.com>