Cosmetics fixes against datastore package

- no functional changes

Change-Id: I220c2df854e748c5a5a888b27d6d79f38523e322
diff --git a/src/main/java/net/onrc/onos/datastore/topology/KVPort.java b/src/main/java/net/onrc/onos/datastore/topology/KVPort.java
index 452bf94..d31026a 100644
--- a/src/main/java/net/onrc/onos/datastore/topology/KVPort.java
+++ b/src/main/java/net/onrc/onos/datastore/topology/KVPort.java
@@ -65,12 +65,12 @@
     }
 
     public static long[] getPortPairFromKey(final ByteBuffer keyBuf) {
-        long[] pair = new long[2];
         if (keyBuf.getChar() != 'S') {
             throw new IllegalArgumentException("Invalid Port key:" + keyBuf
                     + " "
                     + ByteArrayUtil.toHexStringBuffer(keyBuf.array(), ":"));
         }
+        long[] pair = new long[2];
         pair[0] = keyBuf.getLong();
         if (keyBuf.getChar() != 'P') {
             throw new IllegalArgumentException("Invalid Port key:" + keyBuf