Fix compile time NPE which is encountered in Eclipse IDE

Change-Id: Id447967ad6c7c68f4a6e5c562e7245029a89902f
diff --git a/web/api/src/main/java/org/onosproject/rest/resources/NetworkConfigWebResource.java b/web/api/src/main/java/org/onosproject/rest/resources/NetworkConfigWebResource.java
index f11cc05..327d1ca 100644
--- a/web/api/src/main/java/org/onosproject/rest/resources/NetworkConfigWebResource.java
+++ b/web/api/src/main/java/org/onosproject/rest/resources/NetworkConfigWebResource.java
@@ -151,8 +151,7 @@
         Class configClass =
                 nullIsNotFound(service.getConfigClass(subjectClassKey, configKey),
                                configKeyNotFoundErrorString(subjectClassKey, subjectKey, configKey));
-        Config config =
-                (Config) nullIsNotFound(service.getConfig(subject, configClass),
+        Config config = nullIsNotFound((Config) service.getConfig(subject, configClass),
                                configKeyNotFoundErrorString(subjectClassKey,
                                                             subjectKey,
                                                             configKey));