stdlib/calloc: fix size overflow check #1063

Job	Run time
call-ci / build (armv7a7-imx6ull-evk)	1m 17s
call-ci / build (armv7a9-zynq7000-qemu)	1m 17s
call-ci / build (armv7a9-zynq7000-zedboard)	1m 0s
call-ci / build (armv7a9-zynq7000-zturn)	1m 12s
call-ci / build (armv7m4-stm32l4x6-nucleo)	1m 14s
call-ci / build (armv7m7-imxrt105x-evk)	1m 8s
call-ci / build (armv7m7-imxrt106x-evk)	1m 18s
call-ci / build (armv7m7-imxrt117x-evk)	1m 25s
call-ci / build (host-generic-pc)	49s
call-ci / build (ia32-generic-pc)	1m 17s
call-ci / build (ia32-generic-qemu)	1m 12s
call-ci / build (riscv64-generic-qemu)	1m 10s
call-ci / build (riscv64-generic-spike)	1m 0s
call-ci / build (sparcv8leon3-gr716-mini)	1m 9s
call-ci / test HW (armv7a7-imx6ull-evk)	5m 42s
call-ci / test HW (armv7m7-imxrt106x-evk)	2m 28s
call-ci / test EMU (armv7a9-zynq7000-qemu)	9m 0s
call-ci / test HW (armv7m7-imxrt117x-evk)	2m 44s
call-ci / test EMU (host-generic-pc)	59s
call-ci / test HW (armv7a9-zynq7000-zedboard)	7m 13s
call-ci / test EMU (ia32-generic-qemu)	5m 38s
call-ci / test HW (armv7m4-stm32l4x6-nucleo)	9m 15s
call-ci / test EMU (riscv64-generic-qemu)	3m 33s
call-ci / tests-summary	15s
call-ci / send-notification	0s
	1h 3m 15s

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