Leak in boost::asio::detail::posix_event::posix_event()

[pdekeister]

Valgrind analysis gived

 8 bytes in 1 blocks are definitely lost in loss record 6 of 57
    at 0x4C287C4: malloc
    by 0xEA260D2: pthread_condattr_init 
    by 0x74459DE: boost::asio::detail::posix_event::posix_event() 
    by 0x74452BC: boost::asio::detail::scheduler::scheduler(boost::asio::execution_context&, int, bool) 
    by 0x9D3CE22: boost::asio::io_context::io_context() 

pthread_condattr_destroy is missing
I've made a patch seems to correct

--- boost/asio/detail/impl/posix_event.ipp.orig
+++ boost/asio/detail/impl/posix_event.ipp
@@ -45,6 +45,7 @@ posix_event::posix_event()
 #endif // (defined(__MACH__) && defined(__APPLE__))
        // || (defined(__ANDROID__) && (__ANDROID_API__ < 21))
 
+  ::pthread_condattr_destroy(&attr);
   boost::system::error_code ec(error,
       boost::asio::error::get_system_category());
   boost::asio::detail::throw_error(ec, "event");