cosmetic fix for OpticalPathIntent

Change-Id: I596d30be1398bd231f6e0f92e0fb0077a165c149
diff --git a/core/api/src/main/java/org/onosproject/net/intent/OpticalPathIntent.java b/core/api/src/main/java/org/onosproject/net/intent/OpticalPathIntent.java
index d42ce99..4e313c2 100644
--- a/core/api/src/main/java/org/onosproject/net/intent/OpticalPathIntent.java
+++ b/core/api/src/main/java/org/onosproject/net/intent/OpticalPathIntent.java
@@ -89,7 +89,7 @@
         private OchSignal lambda;
         private OchSignalType signalType;
         private boolean isBidirectional;
-        Key key;
+        private Key key;
 
         @Override
         public Builder appId(ApplicationId appId) {