Add missing this :(

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@566109 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/eventadmin/impl/src/main/java/org/apache/felix/eventadmin/impl/tasks/DispatchTask.java b/eventadmin/impl/src/main/java/org/apache/felix/eventadmin/impl/tasks/DispatchTask.java
index f740200..21bb84e 100644
--- a/eventadmin/impl/src/main/java/org/apache/felix/eventadmin/impl/tasks/DispatchTask.java
+++ b/eventadmin/impl/src/main/java/org/apache/felix/eventadmin/impl/tasks/DispatchTask.java
@@ -288,7 +288,7 @@
          */
         public void cancel()
         {
-            synchronized (DispatchTask.m_lock)
+            synchronized (DispatchTask.this.m_lock)
             {
                 m_canceled = true;
             }