Correctly free the QUIC_CONNECTION on failure during construction #620

Job	Run time
compiler (gcc-7, ubuntu-20.04)	7m 22s
compiler (gcc-8, ubuntu-20.04)	6m 16s
compiler (gcc-9, ubuntu-20.04)	7m 55s
compiler (gcc-10, ubuntu-20.04)	8m 26s
compiler (gcc-11, ubuntu-22.04)	8m 21s
compiler (gcc-12, ubuntu-22.04)	7m 9s
compiler (gcc-13, ubuntu-22.04, ubuntu-toolchain-r/test)	8m 25s
compiler (clang-6.0, ubuntu-20.04)	6m 46s
compiler (clang-7, ubuntu-20.04)	6m 49s
compiler (clang-8, ubuntu-20.04)	7m 37s
compiler (clang-9, ubuntu-20.04)	7m 57s
compiler (clang-10, ubuntu-20.04)	7m 27s
compiler (clang-11, ubuntu-20.04)	6m 34s
compiler (clang-12, ubuntu-20.04)	6m 33s
compiler (clang-13, ubuntu-22.04)	7m 52s
compiler (clang-14, ubuntu-22.04)	6m 51s
compiler (clang-15, ubuntu-22.04, jammy)	8m 53s
compiler (clang-16, ubuntu-22.04, jammy)	7m 9s
	2h 14m 22s

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