Deadlock avoided

[RichLogan]

warning: quicr was compiled with optimization - stepping may behave oddly; variables may not be available.* thread #36, stop reason = signal SIGABRT
    frame #0: 0x0000000180fb7720 libsystem_kernel.dylib`__pthread_kill + 8
    frame #1: 0x0000000100e9ffa8 libsystem_pthread.dylib`pthread_kill + 288
    frame #2: 0x0000000180efc908 libsystem_c.dylib`abort + 128
    frame #3: 0x0000000180fa644c libc++abi.dylib`abort_message + 132
    frame #4: 0x0000000180f94a24 libc++abi.dylib`demangling_terminate_handler() + 320
    frame #5: 0x0000000180c3d3f4 libobjc.A.dylib`_objc_terminate() + 172
    frame #6: 0x0000000180fa5710 libc++abi.dylib`std::__terminate(void (*)()) + 16
    frame #7: 0x0000000180fa56b4 libc++abi.dylib`std::terminate() + 108
    frame #8: 0x0000000101bb15ec quicr`__clang_call_terminate + 16
  * frame #9: 0x0000000101bdeb84 quicr`quicr::PicoQuicTransport::~PicoQuicTransport(this=0x0000000141a71a18) at transport_picoquic.cpp:917:5 [opt]
    frame #10: 0x0000000101bcdbbc quicr`quicr::Transport::~Transport() [inlined] std::__1::__shared_count::__release_shared[abi:ne190102](this=0x0000000141a71a00) at shared_ptr.h:158:7 [opt]
    frame #11: 0x0000000101bcdb9c quicr`quicr::Transport::~Transport() [inlined] std::__1::__shared_weak_count::__release_shared[abi:ne190102](this=0x0000000141a71a00) at shared_ptr.h:187:25 [opt]
    frame #12: 0x0000000101bcdb9c quicr`quicr::Transport::~Transport() [inlined] std::__1::shared_ptr<quicr::ITransport>::~shared_ptr[abi:ne190102](this=0x0000000140110330) at shared_ptr.h:670:17 [opt]
    frame #13: 0x0000000101bcdb94 quicr`quicr::Transport::~Transport() [inlined] std::__1::shared_ptr<quicr::ITransport>::~shared_ptr[abi:ne190102](this=0x0000000140110330) at shared_ptr.h:668:39 [opt]
    frame #14: 0x0000000101bcdb94 quicr`quicr::Transport::~Transport(this=0x00000001401100f0) at transport.cpp:93:5 [opt]
    frame #15: 0x00000001024e1148 QuicR.debug.dylib`quicr::Client::~Client(this=0x00000001401100f0) at client.h:33:27