stream: Return None from callback

nobody evaluates the return value.

Signed-off-by: Philipp Hahn <[email protected]>

Author: pmhahn

libvirt-override-virConnect.py

@@ -47,7 +47,6 @@ def _dispatchDomainEventCallbacks(self, dom: 'virDomain', event: int, detail: in
         try:
             for cb, opaque in self.domainEventCallbacks.items():
                 cb(self, virDomain(self, _obj=dom), event, detail, opaque)
-            return 0
         except AttributeError:
             pass
 
@@ -124,7 +123,6 @@ def _dispatchDomainEventBlockJobCallback(self, dom: 'virDomain', disk: str, type
             opaque = cbData["opaque"]
 
             cb(self, virDomain(self, _obj=dom), disk, type, status, opaque)
-            return 0
         except AttributeError:
             pass