drm/i915/selftests: Set igt_spinner.gt for early exit

Set up a default gt pointer for an early cleanup of igt_spinnter, before
a request is created and igt_spinner.gt set to the active engine's.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190708215524.31639-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/selftests/igt_spinner.c

@@ -19,6 +19,7 @@ int igt_spinner_init(struct igt_spinner *spin, struct drm_i915_private *i915)
 
 	memset(spin, 0, sizeof(*spin));
 	spin->i915 = i915;
+	spin->gt = &i915->gt;
 
 	spin->hws = i915_gem_object_create_internal(i915, PAGE_SIZE);
 	if (IS_ERR(spin->hws)) {