Fix typo in log message.

Change-Id: Iacfc7740f62a433749c4bf77bd5d6845306acf4a
diff --git a/dev/core/src/com/google/gwt/dev/jjs/JavaToJavaScriptCompiler.java b/dev/core/src/com/google/gwt/dev/jjs/JavaToJavaScriptCompiler.java
index 4e4304d..a51cd7f 100644
--- a/dev/core/src/com/google/gwt/dev/jjs/JavaToJavaScriptCompiler.java
+++ b/dev/core/src/com/google/gwt/dev/jjs/JavaToJavaScriptCompiler.java
@@ -1448,7 +1448,7 @@
 
     if (options.shouldOptimizeDataflow()) {
       logger.log(TreeLogger.Type.WARN,
-          "Unsafe dataflow optimization enabled, diable with -XdisableOptimizeDataflow.");
+          "Unsafe dataflow optimization enabled, disable with -XdisableOptimizeDataflow.");
       // Just run it once, because it is very time consuming
       allOptimizerStats.add(DataflowOptimizer.exec(jprogram));
     }