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Fix possible undefined behavior in clear_thread_data

Andreas Sturmlechner requested to merge asturmlechner/qtbase:fix-ub-in-clear_thread_data into kde/5.15

Fix possible undefined behavior in clear_thread_data. The key used in pthread_setspecific must be obtained from pthread_key_create or undefined behavior occurs. Use set_thread_data to clear it since it ensures that the key has been obtained using pthread_key_create by calling pthread_once using create_current_thread_data_key. Fixes crash when closing threaded qt apps on NetBSD.

Pick-to: 5.15 6.2 6.3 6.4 Change-Id: I1c7d2628f4248e00a12724a952568f7d92011986 Reviewed-by: Giuseppe D'Angelo giuseppe.dangelo@kdab.com Reviewed-by: Thiago Macieira thiago.macieira@intel.com (cherry picked from commit 6d930533)

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