drm/i915/gt: Always call kref_init for the timeline

Always initialise the refcount, even for the embedded timelines inside
mock devices.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190625233349.32371-2-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/gt/intel_timeline.c

@@ -210,8 +210,11 @@ int intel_timeline_init(struct intel_timeline *timeline,
 {
 	void *vaddr;
 
+	kref_init(&timeline->kref);
+
 	timeline->gt = gt;
 	timeline->pin_count = 0;
+
 	timeline->has_initial_breadcrumb = !hwsp;
 	timeline->hwsp_cacheline = NULL;
 
@@ -357,8 +360,6 @@ intel_timeline_create(struct intel_gt *gt, struct i915_vma *global_hwsp)
 		return ERR_PTR(err);
 	}
 
-	kref_init(&timeline->kref);
-
 	return timeline;
 }