Fix `fcntl_setpipe_size` return value #4273

Job	Run time
Check --no-default-features (nightly)	56s
Check selected Tier 3 platforms (nightly)	5m 3s
Check nightly-only targets (nightly)	22s
Check (stable)	6m 7s
Rustfmt	4s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 11s
Check (nightly)	6m 19s
Test (ubuntu)	41s
Test use-libc (ubuntu)	48s
Test (ubuntu-20.04)	44s
Test use-libc (i686-linux)	54s
Check (1.63)	11m 55s
Test (i686-linux)	1m 0s
Test use-libc (aarch64-linux)	58s
Test (aarch64-linux)	1m 4s
Test use-libc (powerpc64le-linux)	57s
Test (powerpc64le-linux)	1m 4s
Test use-libc (riscv64-linux)	1m 4s
Test (riscv64-linux)	1m 1s
Test use-libc (arm-linux)	1m 6s
Test (s390x-linux)	1m 18s
Test (arm-linux)	1m 17s
Test (ubuntu-stable)	44s
Test (i686-linux-stable)	1m 7s
Test (aarch64-linux-stable)	1m 5s
Test (riscv64-linux-stable)	1m 10s
Test (s390x-linux-stable)	1m 7s
Test (powerpc64le-linux-stable)	1m 10s
Test (arm-linux-stable)	59s
Test (ubuntu-1.63)	2m 28s
Test (i686-linux-1.63)	2m 43s
Test (aarch64-linux-1.63)	2m 59s
Test (riscv64-linux-1.63)	2m 50s
Test (s390x-linux-1.63)	2m 50s
Test (powerpc64le-linux-1.63)	2m 50s
Test (arm-linux-1.63)	3m 5s
Test (macos-latest)	17m 43s
Test (macos-12)	19m 24s
Test (windows)	51s
Test (windows-2019)	55s
Test (musl)	38s
	1h 52m 31s

Provide feedback