Change Optional.ofNullable calls to Optional.of

Nullable check is not needed because argument is known to be non null

Change-Id: Ie3574ad9bbd1eff8a2088ac8da2804ea2f5e90a1
diff --git a/core/net/src/test/java/org/onosproject/net/intent/impl/MplsPathIntentInstallerTest.java b/core/net/src/test/java/org/onosproject/net/intent/impl/MplsPathIntentInstallerTest.java
index c2f616a..d091b9a 100644
--- a/core/net/src/test/java/org/onosproject/net/intent/impl/MplsPathIntentInstallerTest.java
+++ b/core/net/src/test/java/org/onosproject/net/intent/impl/MplsPathIntentInstallerTest.java
@@ -48,9 +48,9 @@
     MplsPathIntentInstaller installer;
 
     private final Optional<MplsLabel> ingressLabel =
-            Optional.ofNullable(MplsLabel.mplsLabel(10));
+            Optional.of(MplsLabel.mplsLabel(10));
     private final Optional<MplsLabel> egressLabel =
-            Optional.ofNullable(MplsLabel.mplsLabel(20));
+            Optional.of(MplsLabel.mplsLabel(20));
 
     private final List<Link> links = Arrays.asList(
             new DefaultLink(PID, d1p1, d2p0, DIRECT),