Fixed some PMD issues in the SDN-IP module

Change-Id: Iaf002e70c1a00f0008edef5e77b91579acf146aa
diff --git a/src/main/java/net/onrc/onos/apps/bgproute/RibEntry.java b/src/main/java/net/onrc/onos/apps/bgproute/RibEntry.java
index 4dccd5f..8e4e12e 100644
--- a/src/main/java/net/onrc/onos/apps/bgproute/RibEntry.java
+++ b/src/main/java/net/onrc/onos/apps/bgproute/RibEntry.java
@@ -60,7 +60,7 @@
 
     @Override
     public boolean equals(Object other) {
-        if (other == null || !(other instanceof RibEntry)) {
+        if (!(other instanceof RibEntry)) {
             return false;
         }