compositor-drm: Fix memory leak in update_outputs
compositor-drm: Fix memory leak in update_outputs

We need to correctly free every connector we retrieve. We currently loose them
if they are not connected.

Signed-off-by: David Herrmann <fb53b2ddb8d141e0cb39d7c67c2f81b6bc2eb0f7@googlemail.com>

Gnurou/weston,eyolfson/weston,xorgy/weston,jonnylamb/weston,krezovic/weston,Fantu/compositor-spice,Fantu/compositor-spice,giucam/weston,Tarnyko/weston-xdg_surface_present,jonnylamb/weston,mchalupa/weston,xorgy/weston,sir-murray/weston,Tarnyko/weston-xdg_surface_present,Fantu/compositor-spice,Gnurou/weston,udoprog/weston,sir-murray/weston,kwm81/weston,giucam/weston,kwm81/weston,krezovic/weston,mchalupa/weston,eyolfson/weston,udoprog/weston