[timeline] Set the n_markers out paramater
[timeline] Set the n_markers out paramater

Bug 1464 - clutter_timeline_list_markers should set n_markers=0 when
           there are no markers

If no markers are registered and we bail out we should also set the
n_markers out parameter to 0 so that code checking the number of
markers will still work.

djdeath/clutter-android,djdeath/clutter-android,collects/clutter,kerrickstaley/clutter-vala,spatulasnout/clutter,GNOME/clutter,ebassi/clutter,dlespiau/clutter,tardyp/clutter,djdeath/clutter-android,djdeath/clutter-multithreaded,tardyp/clutter,Distrotech/clutter,kerrickstaley/clutter-vala,GNOME/clutter,rkudiyarov/clutter_osx,djdeath/clutter,djdeath/clutter,heysion/clutter-clone,dlespiau/clutter,Distrotech/clutter,rkudiyarov/clutter_osx,rkudiyarov/clutter_osx,kerrickstaley/clutter-vala,spatulasnout/clutter,djdeath/clutter,collects/clutter,Distrotech/clutter,collects/clutter,kerrickstaley/clutter-vala,heysion/clutter-clone,rkudiyarov/clutter_osx,nobled/clutter,heysion/clutter-clone,heysion/clutter-clone,djdeath/clutter-multithreaded,ebassi/clutter,djdeath/clutter-multithreaded,djdeath/clutter,djdeath/clutter,collects/clutter,ebassi/clutter,nobled/clutter,dlespiau/clutter,ebassi/clutter,GNOME/clutter,heysion/clutter-clone,spatulasnout/clutter,jigpu/clutter,tardyp/clutter,jigpu/clutter,Distrotech/clutter,djdeath/clutter,ebassi/clutter,Distrotech/clutter,djdeath/clutter-multithreaded,GNOME/clutter,jigpu/clutter,jigpu/clutter,collects/clutter,spatulasnout/clutter,djdeath/clutter-android,nobled/clutter,GNOME/clutter,spatulasnout/clutter,jigpu/clutter,Distrotech/clutter,jigpu/clutter,djdeath/clutter-android