mktemp: Fix wrong divisor value for modulo operation #919

Job	Run time
call-ci / build (armv7a7-imx6ull-evk)	1m 11s
call-ci / build (armv7a9-zynq7000-qemu)	1m 38s
call-ci / build (armv7a9-zynq7000-zedboard)	1m 44s
call-ci / build (armv7a9-zynq7000-zturn)	1m 34s
call-ci / build (armv7m4-stm32l4x6-nucleo)	1m 19s
call-ci / build (armv7m7-imxrt105x-evk)	2m 3s
call-ci / build (armv7m7-imxrt106x-evk)	1m 33s
call-ci / build (armv7m7-imxrt117x-evk)	1m 29s
call-ci / build (host-generic-pc)	1m 14s
call-ci / build (ia32-generic-pc)	1m 20s
call-ci / build (ia32-generic-qemu)	2m 4s
call-ci / build (riscv64-generic-qemu)	1m 11s
call-ci / build (riscv64-generic-spike)	1m 4s
call-ci / build (sparcv8leon3-gr716-mini)	1m 32s
call-ci / test EMU (armv7a9-zynq7000-qemu)	8m 57s
call-ci / test HW (armv7a7-imx6ull-evk)	4m 57s
call-ci / test EMU (host-generic-pc)	1m 11s
call-ci / test HW (armv7m7-imxrt106x-evk)	2m 19s
call-ci / test HW (armv7m7-imxrt117x-evk)	2m 52s
call-ci / test EMU (ia32-generic-qemu)	7m 10s
call-ci / test HW (armv7a9-zynq7000-zedboard)	6m 52s
call-ci / test EMU (riscv64-generic-qemu)	2m 41s
call-ci / test HW (armv7m4-stm32l4x6-nucleo)	7m 45s
call-ci / tests-summary	30s
call-ci / send-notification	0s
	1h 6m 10s

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