unistd/dir: fix resolve_path behavior on trailing slashes #1099

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)	58s
call-ci / build (armv7a9-zynq7000-zturn)	1m 5s
call-ci / build (armv7m4-stm32l4x6-nucleo)	1m 7s
call-ci / build (armv7m7-imxrt105x-evk)	1m 19s
call-ci / build (armv7m7-imxrt106x-evk)	1m 31s
call-ci / build (armv7m7-imxrt117x-evk)	1m 13s
call-ci / build (host-generic-pc)	1m 7s
call-ci / build (ia32-generic-pc)	1m 4s
call-ci / build (ia32-generic-qemu)	1m 16s
call-ci / build (riscv64-generic-qemu)	1m 0s
call-ci / build (riscv64-generic-spike)	1m 4s
call-ci / build (sparcv8leon3-gr716-mini)	55s
call-ci / test EMU (armv7a9-zynq7000-qemu)	10m 59s
call-ci / test HW (armv7a7-imx6ull-evk)	6m 8s
call-ci / test EMU (host-generic-pc)	55s
call-ci / test HW (armv7m7-imxrt106x-evk)	2m 56s
call-ci / test EMU (ia32-generic-qemu)	6m 4s
call-ci / test HW (armv7m7-imxrt117x-evk)	3m 12s
call-ci / test EMU (riscv64-generic-qemu)	5m 29s
call-ci / test HW (armv7a9-zynq7000-zedboard)	8m 0s
call-ci / test HW (armv7m4-stm32l4x6-nucleo)	9m 44s
call-ci / tests-summary	17s
call-ci / send-notification	0s
	1h 9m 57s

Provide feedback