Only unbind the original event handler.

Author: blueimp

js/jquery.fileupload-ui.js

@@ -604,15 +604,16 @@
         node.hasClass('fade') &&
         node.is(':visible')
       ) {
+        var transitionEndHandler = function(e) {
+          // Make sure we don't respond to other transition events
+          // in the container element, e.g. from button elements:
+          if (e.target === node[0]) {
+            node.unbind($.support.transition.end, transitionEndHandler);
+            dfd.resolveWith(node);
+          }
+        };
         node
-          .bind($.support.transition.end, function(e) {
-            // Make sure we don't respond to other transitions events
-            // in the container element, e.g. from button elements:
-            if (e.target === node[0]) {
-              node.unbind($.support.transition.end);
-              dfd.resolveWith(node);
-            }
-          })
+          .bind($.support.transition.end, transitionEndHandler)
           .toggleClass('in');
       } else {
         node.toggleClass('in');