cm4-tool: send path with terminating '\0' #963

Job	Run time
call-ci / build (armv7a7-imx6ull-evk)	1m 8s
call-ci / build (armv7a9-zynq7000-qemu)	1m 19s
call-ci / build (armv7a9-zynq7000-zedboard)	1m 1s
call-ci / build (armv7a9-zynq7000-zturn)	1m 10s
call-ci / build (armv7m4-stm32l4x6-nucleo)	1m 3s
call-ci / build (armv7m7-imxrt105x-evk)	1m 21s
call-ci / build (armv7m7-imxrt106x-evk)	1m 17s
call-ci / build (armv7m7-imxrt117x-evk)	1m 30s
call-ci / build (host-generic-pc)	51s
call-ci / build (ia32-generic-pc)	1m 3s
call-ci / build (ia32-generic-qemu)	1m 1s
call-ci / build (riscv64-generic-qemu)	1m 12s
call-ci / build (riscv64-generic-spike)	59s
call-ci / build (sparcv8leon3-gr716-mini)	1m 6s
call-ci / test EMU (armv7a9-zynq7000-qemu)	8m 11s
call-ci / test HW (armv7a7-imx6ull-evk)	6m 6s
call-ci / test EMU (host-generic-pc)	52s
call-ci / test HW (armv7m7-imxrt106x-evk)	2m 39s
call-ci / test EMU (ia32-generic-qemu)	6m 24s
call-ci / test HW (armv7m7-imxrt117x-evk)	3m 3s
call-ci / test EMU (riscv64-generic-qemu)	5m 44s
call-ci / test HW (armv7a9-zynq7000-zedboard)	7m 54s
call-ci / test HW (armv7m4-stm32l4x6-nucleo)	12m 14s
call-ci / tests-summary	18s
call-ci / send-notification / send-notif	4s
	1h 9m 30s

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