Fix for size_t in UpnpString. (cherry picked from commit ee5bd670d4eeb09bf2ebc0e01a902ebac93aa5b8)
Fix for size_t in UpnpString.
(cherry picked from commit ee5bd670d4eeb09bf2ebc0e01a902ebac93aa5b8)

BelledonneCommunications/libupnp,commshare/pupnp,mrjimenez/pupnp,commshare/pupnp,mrjimenez/pupnp,BelledonneCommunications/libupnp,commshare/pupnp,mrjimenez/pupnp,BelledonneCommunications/libupnp,BelledonneCommunications/libupnp,mrjimenez/pupnp