Comment # 3 on bug 62721 from Maarten Baert

Some of the Arch packages were updated, so just to be sure I re-ran my old
apitrace with both the original Arch Linux package 'ati-dri' and the one I
modified with your patch. The old package again caused a lockup, the new one
didn't, so it looks like this does indeed fix the lockup. Thanks!