compositor: Fix invalid view numbering in scene-graph

With the addition of patch 433f4e77 we display the same view id (0)
for every view as we're modifying the local variable.

Displaying sub-surfaces based views is also problematic. The caller need
to modify the view number as well, so we instead we pass the address as
to allow that to happen. Otherwise we end up repeating the same number
for views without sub-subrfaces once those have been printed.

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>