Better fix for build bustage from patch for bug 603844.

--HG--
extra : rebase_source : 39bcb6558ecd109c67166ea836b241a8215b7164

content/xslt/src/xslt/txMozillaXSLTProcessor.cpp

@@ -155,7 +155,9 @@ txToDocHandlerFactory::createHandlerWith(txOutputFormat* aFormat,
         }
     }
 
-    return NS_OK;
+    NS_RUNTIMEABORT("Unknown output method");
+
+    return NS_ERROR_FAILURE;
 }
 
 nsresult
@@ -203,7 +205,9 @@ txToDocHandlerFactory::createHandlerWith(txOutputFormat* aFormat,
         }
     }
 
-    return NS_OK;
+    NS_RUNTIMEABORT("Unknown output method");
+
+    return NS_ERROR_FAILURE;
 }
 
 nsresult