Bug 223302. ASSERTION: OnDataAvailable implementation consumed no data: nsParser. r=bz, sr=darin

parser/htmlparser/src/nsParser.cpp

@@ -2568,6 +2568,9 @@ nsresult nsParser::OnDataAvailable(nsIRequest *request, nsISupports* aContext,
       rv = ResumeParse();
     }
   }
+  else {
+    rv = NS_ERROR_UNEXPECTED;
+  }
 
   return rv;
 }