drm/i915: Only add the lazy request if we end up waiting for it.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 68043f1..d73145c 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -87,7 +87,7 @@
 	/**
 	 * Do we have some not yet emitted requests outstanding?
 	 */
-	bool outstanding_lazy_request;
+	u32 outstanding_lazy_request;
 
 	wait_queue_head_t irq_queue;
 	drm_local_map_t map;