Enable checkstyle rule for boolean return statement
that can be simplified.

Enable the "SimplifyBooleanReturn" checkstyle rule and fix
the violations is causes.

Change-Id: I3465c76d863d49ca71895d9c8d55b86e4a37d0f1
diff --git a/src/main/java/net/onrc/onos/apps/bgproute/Ptree.java b/src/main/java/net/onrc/onos/apps/bgproute/Ptree.java
index 3959986..e370fdf 100644
--- a/src/main/java/net/onrc/onos/apps/bgproute/Ptree.java
+++ b/src/main/java/net/onrc/onos/apps/bgproute/Ptree.java
@@ -224,11 +224,7 @@
 
         bit >>= shift;
 
-        if ((bit & 1) == 1) {
-            return true;
-        } else {
-            return false;
-        }
+        return ((bit & 1) == 1);
     }
 
     private void node_link(PtreeNode node, PtreeNode add) {