mmap: make interface posix compliant #1341

Job	Run time
call-ci / build (armv7a7-imx6ull-evk)	48s
call-ci / build (armv7a9-zynq7000-qemu)	46s
call-ci / build (armv7a9-zynq7000-zedboard)	43s
call-ci / build (armv7a9-zynq7000-zturn)	44s
call-ci / build (armv7m4-stm32l4x6-nucleo)	47s
call-ci / build (armv7m7-imxrt105x-evk)	47s
call-ci / build (armv7m7-imxrt106x-evk)	46s
call-ci / build (armv7m7-imxrt117x-evk)	56s
call-ci / build (host-generic-pc)	57s
call-ci / build (ia32-generic-pc)	47s
call-ci / build (ia32-generic-qemu)	48s
call-ci / build (riscv64-generic-qemu)	52s
call-ci / build (riscv64-generic-spike)	45s
call-ci / build (sparcv8leon3-gr716-mini)	46s
call-ci / test HW	0s
call-ci / test EMU	0s
call-ci / tests-summary	10s
call-ci / send-notification	0s
	11m 22s

Provide feedback