drm/i915: Rename local struct intel_engine_cs variables

Done by the Coccinelle script below plus a manual
intervention to GEN8_RING_SEMAPHORE_INIT.

@@
expression E;
@@
- struct intel_engine_cs *ring = E;
+ struct intel_engine_cs *engine = E;
<+...
- ring
+ engine
...+>
@@
@@
- struct intel_engine_cs *ring;
+ struct intel_engine_cs *engine;
<+...
- ring
+ engine
...+>

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/i915_gem_debug.c b/drivers/gpu/drm/i915/i915_gem_debug.c
index 17299d0..202a7e6 100644
--- a/drivers/gpu/drm/i915/i915_gem_debug.c
+++ b/drivers/gpu/drm/i915/i915_gem_debug.c
@@ -36,29 +36,30 @@
 	static int warned;
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct drm_i915_gem_object *obj;
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	int err = 0;
 	int i;
 
 	if (warned)
 		return 0;
 
-	for_each_ring(ring, dev_priv, i) {
-		list_for_each_entry(obj, &ring->active_list, ring_list[ring->id]) {
+	for_each_ring(engine, dev_priv, i) {
+		list_for_each_entry(obj, &engine->active_list,
+				    ring_list[engine->id]) {
 			if (obj->base.dev != dev ||
 			    !atomic_read(&obj->base.refcount.refcount)) {
 				DRM_ERROR("%s: freed active obj %p\n",
-					  ring->name, obj);
+					  engine->name, obj);
 				err++;
 				break;
 			} else if (!obj->active ||
-				   obj->last_read_req[ring->id] == NULL) {
+				   obj->last_read_req[engine->id] == NULL) {
 				DRM_ERROR("%s: invalid active obj %p\n",
-					  ring->name, obj);
+					  engine->name, obj);
 				err++;
 			} else if (obj->base.write_domain) {
 				DRM_ERROR("%s: invalid write obj %p (w %x)\n",
-					  ring->name,
+					  engine->name,
 					  obj, obj->base.write_domain);
 				err++;
 			}