Fix a typo for 1.9.1 support

git-svn-id: file:///home/svn/framework3/trunk@7232 4d416f70-5f16-0410-b530-b9f4589650da

lib/msf/ui/gtk2/treeviewtooltips.rb

@@ -174,7 +174,7 @@ module Msf
           end
 
           # if we have something queued up, cancel it
-          if @next:
+          if @next
             Gtk.timeout_remove(@next)
             @next = nil
           end
@@ -198,4 +198,4 @@ module Msf
 
     end
   end
-end
+end