Give more significant name to a variable

Author: elecharny

mina-core/src/main/java/org/apache/mina/core/service/IoServiceListenerSupport.java

@@ -252,9 +252,9 @@ public void fireSessionDestroyed(IoSession session) {
 
         // Fire listener events.
         try {
-            for (IoServiceListener l : listeners) {
+            for (IoServiceListener listener : listeners) {
                 try {
-                    l.sessionDestroyed(session);
+                    listener.sessionDestroyed(session);
                 } catch (Exception e) {
                     ExceptionMonitor.getInstance().exceptionCaught(e);
                 }