fix some of findbugs issues

Change-Id: I20aa54af16f3a1e3323d735fe53cc26c03d5e52e
diff --git a/utils/misc/src/main/java/org/onlab/packet/ChassisId.java b/utils/misc/src/main/java/org/onlab/packet/ChassisId.java
index 5b48e63..4555124 100644
--- a/utils/misc/src/main/java/org/onlab/packet/ChassisId.java
+++ b/utils/misc/src/main/java/org/onlab/packet/ChassisId.java
@@ -32,7 +32,7 @@
      * @param value the value to use.
      */
     public ChassisId(String value) {
-        this.value = Long.valueOf(value, 16);
+        this.value = Long.parseLong(value, 16);
     }
 
     /**