Fix checkstyle whitespace issues - WHITESPACE ONLY

Change-Id: Ic205c1afd639c6008d61d9de95cb764eeb6238ca
diff --git a/src/main/java/net/onrc/onos/apps/proxyarp/PacketOutNotification.java b/src/main/java/net/onrc/onos/apps/proxyarp/PacketOutNotification.java
index bd64e59..c0b56a7 100644
--- a/src/main/java/net/onrc/onos/apps/proxyarp/PacketOutNotification.java
+++ b/src/main/java/net/onrc/onos/apps/proxyarp/PacketOutNotification.java
@@ -8,20 +8,21 @@
  * abstract base class that will be subclassed by specific types of
  * notifications.
  */
-public abstract class PacketOutNotification implements Serializable{
+public abstract class PacketOutNotification implements Serializable {
 
     private static final long serialVersionUID = 1L;
 
     protected final byte[] packet;
-    
+
     /**
      * Class constructor.
+     *
      * @param packet the packet data to send in the packet-out
      */
     public PacketOutNotification() {
-    	packet = null;
+        packet = null;
     }
-    
+
     public PacketOutNotification(byte[] packet) {
         this.packet = packet;
     }