protocol: Add a couple of missing allow-null annotations

wl_data_device.set_selection() allows NULL to withdraw the previously set
selection and wl_surface.attach() allows a NULL buffer to hide the surface.

diff --git a/protocol/wayland.xml b/protocol/wayland.xml
index 06b3d0f..54fb9e0 100644 (file)
--- a/protocol/wayland.xml
+++ b/protocol/wayland.xml
@@ -342,7 +342,7 @@
     </request>
 
     <request name="set_selection">
-      <arg name="source" type="object" interface="wl_data_source"/>
+      <arg name="source" type="object" interface="wl_data_source" allow-null="true"/>
       <arg name="serial" type="uint"/>
     </request>
 
@@ -635,7 +635,7 @@
        corner, relative to the old buffers upper left corner.
       </description>
 
-      <arg name="buffer" type="object" interface="wl_buffer"/>
+      <arg name="buffer" type="object" interface="wl_buffer" allow-null="true"/>
       <arg name="x" type="int"/>
       <arg name="y" type="int"/>
     </request>