Remove unnecessary semicolons

Change-Id: I2b4429d7a2d61b5ba7fe89e73735db14b8244bb8
diff --git a/core/api/src/main/java/org/onosproject/net/group/GroupService.java b/core/api/src/main/java/org/onosproject/net/group/GroupService.java
index 692bde8..47e0882 100644
--- a/core/api/src/main/java/org/onosproject/net/group/GroupService.java
+++ b/core/api/src/main/java/org/onosproject/net/group/GroupService.java
@@ -115,7 +115,7 @@
     /**
      * Purges all group entries.
      */
-    default void purgeGroupEntries() {};
+    default void purgeGroupEntries() {}
 
     /**
      * Deletes a group associated to an application cookie.