Remove the unused code

The "return" here is redundant.

Change-Id: I647f381d7d04fdc6a149fca901b728211b35b5af

neutron/services/metering/agents/metering_agent.py

@@ -277,7 +277,6 @@ class MeteringAgentWithStateReport(MeteringAgent):
             LOG.warning("Neutron server does not support state report. "
                         "State report for this agent will be disabled.")
             self.heartbeat.stop()
-            return
         except Exception:
             LOG.exception("Failed reporting state!")