properly initialize the result recycler when evaluating xslt PI params. r/sr=peterv b=362297 a=stuart

content/xslt/src/xslt/txMozillaXSLTProcessor.cpp

@@ -485,6 +485,9 @@ txMozillaXSLTProcessor::AddXSLTParam(const nsString& aName,
         if (!mRecycler) {
             mRecycler = new txResultRecycler;
             NS_ENSURE_TRUE(mRecycler, NS_ERROR_OUT_OF_MEMORY);
+
+            rv = mRecycler->init();
+            NS_ENSURE_SUCCESS(rv, rv);
         }
 
         txXSLTParamContext paramContext(&mParamNamespaceMap, *contextNode,