Fix a typo in manufacturerDescription() method name

Change-Id: I8f95c6c0aa1ac6c59644828ddf2b82eea4c380a3
diff --git a/providers/openflow/device/src/test/java/org/onosproject/provider/of/device/impl/OpenFlowDeviceProviderTest.java b/providers/openflow/device/src/test/java/org/onosproject/provider/of/device/impl/OpenFlowDeviceProviderTest.java
index ec27084..cfee02f 100644
--- a/providers/openflow/device/src/test/java/org/onosproject/provider/of/device/impl/OpenFlowDeviceProviderTest.java
+++ b/providers/openflow/device/src/test/java/org/onosproject/provider/of/device/impl/OpenFlowDeviceProviderTest.java
@@ -344,7 +344,7 @@
         }
 
         @Override
-        public String manfacturerDescription() {
+        public String manufacturerDescription() {
             return null;
         }