[xml] possible race condition

[Hovnatan Karapetyan <hovnatan gmail com>]

Hi,

To my question on possible non thread-safe code in libxml2 on stackoverflow (http://stackoverflow.com/questions/34007044/libxml2-multithreading-errors-in-helgrind) I got a reply that there is indeed a race condition at https://git.gnome.org/browse/libxml2/tree/catalog.c#n1634. Could anyone please confirm this?

Thanks,

Hovnatan