update OFDeviceProviderTest - roleAssertFail

Change-Id: Iccdda5a11a3a6aa019e1641d068e10b2b17c9798
diff --git a/core/net/src/main/java/org/onlab/onos/net/device/impl/DeviceManager.java b/core/net/src/main/java/org/onlab/onos/net/device/impl/DeviceManager.java
index 3162895..80b9b18 100644
--- a/core/net/src/main/java/org/onlab/onos/net/device/impl/DeviceManager.java
+++ b/core/net/src/main/java/org/onlab/onos/net/device/impl/DeviceManager.java
@@ -233,7 +233,7 @@
         @Override
         public void unableToAssertRole(DeviceId deviceId, MastershipRole role) {
             // FIXME: implement response to this notification
-            log.warn("Falied to assert role [{}] onto Device {}",
+            log.warn("Failed to assert role [{}] onto Device {}",
                     role, deviceId);
         }
     }