Revert "drm/i915: Unreference object not handle on creation"

This reverts commit 86f100b136626e91f4f66f3776303475e2e58998.

The kref API requires the handlecount to be initialised to one on object
creation (so that kref_get() doesn't complain upon first use) so the
dalliance in the drivers is required in order to sink the initial
floating reference.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index df5a713..68526f4 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -135,12 +135,15 @@
 		return -ENOMEM;
 
 	ret = drm_gem_handle_create(file_priv, obj, &handle);
-	drm_gem_object_unreference_unlocked(obj);
-	if (ret)
+	if (ret) {
+		drm_gem_object_unreference_unlocked(obj);
 		return ret;
+	}
+
+	/* Sink the floating reference from kref_init(handlecount) */
+	drm_gem_object_handle_unreference_unlocked(obj);
 
 	args->handle = handle;
-
 	return 0;
 }