Fix Sonar issue:

Strings literals should be placed on the left side when checking for
equality

Change-Id: I4537e08936731ace55aeecb3ad941269ec1eb191
diff --git a/src/main/java/org/onosproject/segmentrouting/cli/PolicyAddCommand.java b/src/main/java/org/onosproject/segmentrouting/cli/PolicyAddCommand.java
index 14694a9..b3b995a 100644
--- a/src/main/java/org/onosproject/segmentrouting/cli/PolicyAddCommand.java
+++ b/src/main/java/org/onosproject/segmentrouting/cli/PolicyAddCommand.java
@@ -99,7 +99,7 @@
         if (dstPort != 0) {
             tpb.setDstPort(dstPort);
         }
-        if (!proto.equals("ip")) {
+        if (!"ip".equals(proto)) {
             tpb.setIpProto(proto);
         }
         if (Policy.Type.valueOf(policyType) == Policy.Type.TUNNEL_FLOW) {