drm/nouveau/radeon: add static const to the dma-buf ops.

Reported-by: wfg@linux.intel.com
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/radeon_prime.c b/drivers/gpu/drm/radeon/radeon_prime.c
index 24f5175..b8f835d 100644
--- a/drivers/gpu/drm/radeon/radeon_prime.c
+++ b/drivers/gpu/drm/radeon/radeon_prime.c
@@ -85,7 +85,7 @@
 
 }
 
-struct dma_buf_ops radeon_dmabuf_ops =  {
+const static struct dma_buf_ops radeon_dmabuf_ops =  {
 	.map_dma_buf = radeon_gem_map_dma_buf,
 	.unmap_dma_buf = radeon_gem_unmap_dma_buf,
 	.release = radeon_gem_dmabuf_release,