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/util/FlowPath.java b/src/main/java/net/onrc/onos/core/util/FlowPath.java
index 0286bd2..2314dfc 100644
--- a/src/main/java/net/onrc/onos/core/util/FlowPath.java
+++ b/src/main/java/net/onrc/onos/core/util/FlowPath.java
@@ -64,8 +64,9 @@
      */
     @JsonIgnore
     public boolean isValidFlowId() {
-        if (this.flowId == null)
+        if (this.flowId == null) {
             return false;
+        }
         return (this.flowId.isValid());
     }
 
@@ -316,12 +317,15 @@
         ret += " idleTimeout=" + this.idleTimeout;
         ret += " hardTimeout=" + this.hardTimeout;
         ret += " priority=" + this.priority;
-        if (dataPath != null)
+        if (dataPath != null) {
             ret += " dataPath=" + this.dataPath.toString();
-        if (flowEntryMatch != null)
+        }
+        if (flowEntryMatch != null) {
             ret += " flowEntryMatch=" + this.flowEntryMatch.toString();
-        if (flowEntryActions != null)
+        }
+        if (flowEntryActions != null) {
             ret += " flowEntryActions=" + this.flowEntryActions.toString();
+        }
         ret += "]";
         return ret;
     }