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/FlowEntry.java b/src/main/java/net/onrc/onos/core/util/FlowEntry.java
index 0204590..768f942 100644
--- a/src/main/java/net/onrc/onos/core/util/FlowEntry.java
+++ b/src/main/java/net/onrc/onos/core/util/FlowEntry.java
@@ -144,8 +144,9 @@
      */
     @JsonIgnore
     public boolean isValidFlowId() {
-        if (this.flowId == null)
+        if (this.flowId == null) {
             return false;
+        }
         return (this.flowId.isValid());
     }
 
@@ -176,8 +177,9 @@
      */
     @JsonIgnore
     public boolean isValidFlowEntryId() {
-        if (this.flowEntryId == null)
+        if (this.flowEntryId == null) {
             return false;
+        }
         return (this.flowEntryId.isValid());
     }