Fix Sonar issue:

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

Change-Id: I4537e08936731ace55aeecb3ad941269ec1eb191
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/TopologyViewMessageHandlerBase.java b/web/gui/src/main/java/org/onosproject/ui/impl/TopologyViewMessageHandlerBase.java
index bd2574b..7fb5d95 100644
--- a/web/gui/src/main/java/org/onosproject/ui/impl/TopologyViewMessageHandlerBase.java
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/TopologyViewMessageHandlerBase.java
@@ -489,7 +489,7 @@
             .id(hostId.toString())
             .addProp(Properties.MAC, host.mac())
             .addProp(Properties.IP, host.ipAddresses(), "[\\[\\]]")
-            .addProp(Properties.VLAN, vlan.equals("-1") ? "none" : vlan)
+            .addProp(Properties.VLAN, "-1".equals(vlan) ? "none" : vlan)
             .addSeparator()
             .addProp(Properties.LATITUDE, annot.value(AnnotationKeys.LATITUDE))
             .addProp(Properties.LONGITUDE, annot.value(AnnotationKeys.LONGITUDE));