pthread: fix key destructor calling and start function exit #912

Job	Run time
call-ci / build (armv7a7-imx6ull-evk)	1m 41s
call-ci / build (armv7a9-zynq7000-qemu)	1m 43s
call-ci / build (armv7a9-zynq7000-zedboard)	1m 33s
call-ci / build (armv7a9-zynq7000-zturn)	1m 22s
call-ci / build (armv7m4-stm32l4x6-nucleo)	1m 48s
call-ci / build (armv7m7-imxrt105x-evk)	1m 35s
call-ci / build (armv7m7-imxrt106x-evk)	1m 28s
call-ci / build (armv7m7-imxrt117x-evk)	1m 54s
call-ci / build (host-generic-pc)	1m 3s
call-ci / build (ia32-generic-pc)	1m 52s
call-ci / build (ia32-generic-qemu)	1m 47s
call-ci / build (riscv64-generic-qemu)	1m 21s
call-ci / build (riscv64-generic-spike)	1m 29s
call-ci / build (sparcv8leon3-gr716-mini)	59s
call-ci / test HW (armv7a7-imx6ull-evk)	5m 9s
call-ci / test HW (armv7m7-imxrt106x-evk)	2m 22s
call-ci / test EMU (armv7a9-zynq7000-qemu)	8m 33s
call-ci / test HW (armv7m7-imxrt117x-evk)	3m 7s
call-ci / test EMU (host-generic-pc)	55s
call-ci / test HW (armv7a9-zynq7000-zedboard)	6m 9s
call-ci / test EMU (ia32-generic-qemu)	5m 38s
call-ci / test HW (armv7m4-stm32l4x6-nucleo)	8m 2s
call-ci / test EMU (riscv64-generic-qemu)	3m 6s
call-ci / tests-summary	32s
call-ci / send-notification	0s
	1h 5m 8s

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