Sonar suggestions - fixes to potential null pointer dereferences

Change-Id: I4e350a9d72a9322971d5d4f831f1bdf167986b87
diff --git a/providers/host/src/main/java/org/onosproject/provider/host/impl/HostLocationProvider.java b/providers/host/src/main/java/org/onosproject/provider/host/impl/HostLocationProvider.java
index eadb4cf..0633d12 100644
--- a/providers/host/src/main/java/org/onosproject/provider/host/impl/HostLocationProvider.java
+++ b/providers/host/src/main/java/org/onosproject/provider/host/impl/HostLocationProvider.java
@@ -418,6 +418,7 @@
             // IPv6: Use Neighbor Discovery
             //TODO need to implement ndp probe
             log.info("Triggering probe on device {} ", host);
+            return;
         }
 
         TrafficTreatment treatment = DefaultTrafficTreatment.builder().setOutput(host.location().port()).build();