QFutureInterface: clean up mutex() method for Qt 6

Ditch the QMutex *mutex() method that we had to keep around for binary
compatibility and drop the disambiguation argument of QMutex
&mutex(int) now that we don't need it anymore.

The lock_guard lines now look dangerously close to C++'s Most Vexing
Parse, so use braced initialization to make sure it's parsed as a
definition, not a declaration.

Change-Id: Ie3d70f58c9878ab6d7da8f8bd72a4cb4aff83bb7
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

0 files changed, 0 insertions, 0 deletions