dzn: Fix conditions for barrier in texture-converting copy case
Otherwise we wouldn't synchronize back-to-back copies and the second one might not read the data that was written by the first.
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
Otherwise we wouldn't synchronize back-to-back copies and the second one might not read the data that was written by the first.