Use Objects.nonNull() to check if non-null

Change-Id: Ib32f56c1d53e4199592f457d04660228b7f437aa
diff --git a/core/security/src/main/java/org/onosproject/security/store/DistributedSecurityModeStore.java b/core/security/src/main/java/org/onosproject/security/store/DistributedSecurityModeStore.java
index b880ffd..feda424 100644
--- a/core/security/src/main/java/org/onosproject/security/store/DistributedSecurityModeStore.java
+++ b/core/security/src/main/java/org/onosproject/security/store/DistributedSecurityModeStore.java
@@ -46,6 +46,7 @@
 import org.slf4j.Logger;
 
 import java.util.HashSet;
+import java.util.Objects;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.stream.Collectors;
@@ -190,7 +191,7 @@
         }
 
         states.computeIf(appId,
-                securityInfo -> (securityInfo != null),
+                Objects::nonNull,
                 (id, securityInfo) -> {
                     switch (securityInfo.getState()) {
                         case POLICY_VIOLATED: