drm/qxl: Fix return for qxl_release_alloc

This function return handle to allocated release object which is an int.
Signed-off-by: NFrediano Ziglio <fziglio@redhat.com>
Reviewed-by: NDave Airlie <airlied@redhat.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

drivers/gpu/drm/qxl/qxl_release.c

@@ -122,7 +122,7 @@ static const struct fence_ops qxl_fence_ops = {
 	.wait = qxl_fence_wait,
 };
 
-static uint64_t
+static int
 qxl_release_alloc(struct qxl_device *qdev, int type,
 		  struct qxl_release **ret)
 {