Enable checkstyle check for blocks without braces.

Enable the checkstyle rule to check for block statements
without curly braces and fix any violations it finds.

Change-Id: Id4c58cea26f0d9ce7ed78643a4943c042886a12d
diff --git a/src/main/java/net/onrc/onos/core/devicemanager/OnosDeviceManager.java b/src/main/java/net/onrc/onos/core/devicemanager/OnosDeviceManager.java
index a724caa..231c1a0 100644
--- a/src/main/java/net/onrc/onos/core/devicemanager/OnosDeviceManager.java
+++ b/src/main/java/net/onrc/onos/core/devicemanager/OnosDeviceManager.java
@@ -251,8 +251,9 @@
         long dlAddr = Ethernet.toLong(dlAddrArr);
 
         // Ignore broadcast/multicast source
-        if ((dlAddrArr[0] & 0x1) != 0)
+        if ((dlAddrArr[0] & 0x1) != 0) {
             return null;
+        }
 
         short vlan = eth.getVlanID();
         int nwSrc = getSrcNwAddr(eth, dlAddr);