switch: fix add_callback

francois-berder · francois-berder · commit b752512bcfd0 · 2016-08-22T20:03:02.000+01:00
Signed-off-by: Francois Berder &lt;fberder@outlook.fr&gt;
diff --git a/letmecreate/core/switch.py b/letmecreate/core/switch.py
@@ -40,6 +40,7 @@ def add_callback(event_mask, callback):
     if ret < 0:
         raise Exception("switch add callback failed")
     _CALLBACKS[ret] = ptr
+    return ret
 
 
 def remove_callback(callback_id):
