Bug #43652 --> fix running of JS urls by returning the error status of the

underlying file transport if the input stream channel doesn't have an error
of it's own.
r=warren

netwerk/base/src/nsInputStreamChannel.cpp

@@ -194,6 +194,12 @@ NS_IMETHODIMP
 nsStreamIOChannel::GetStatus(nsresult *status)
 {
     *status = mStatus;
+    // if we don't have a status error of our own to report
+    // then we should propogate the status error of the underlying
+    // file transport (if we have one)
+    if (NS_SUCCEEDED(mStatus) && mFileTransport)
+      mFileTransport->GetStatus(status);
+
     return NS_OK;
 }