drm/i915: Rename request reference/unreference to get/put

Now that we derive requests from struct fence, swap over to its
nomenclature for references. It's shorter and more idiomatic across the
kernel.

s/i915_gem_request_reference/i915_gem_request_get/
s/i915_gem_request_unreference/i915_gem_request_put/

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1469005202-9659-2-git-send-email-chris@chris-wilson.co.uk
Link: http://patchwork.freedesktop.org/patch/msgid/1469017917-15134-1-git-send-email-chris@chris-wilson.co.uk
diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c
index 2314c88..ba16e04 100644
--- a/drivers/gpu/drm/i915/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/i915_gem_userptr.c
@@ -78,7 +78,7 @@
 		if (req == NULL)
 			continue;
 
-		requests[n++] = i915_gem_request_reference(req);
+		requests[n++] = i915_gem_request_get(req);
 	}
 
 	mutex_unlock(&dev->struct_mutex);
@@ -89,7 +89,7 @@
 	mutex_lock(&dev->struct_mutex);
 
 	for (i = 0; i < n; i++)
-		i915_gem_request_unreference(requests[i]);
+		i915_gem_request_put(requests[i]);
 }
 
 static void cancel_userptr(struct work_struct *work)