refactor: I/O safety for sys/stat.rs #1191

Job	Run time
macos	3m 6s
rust_stable	1m 27s
linux_native_builds (x86_64-unknown-linux-gnu)	2m 31s
macos-aarch64	1m 43s
linux_native_builds (x86_64-unknown-linux-musl)	2m 23s
minver	16s
rustfmt	12s
tier3 (x86_64-unknown-dragonfly)	59s
tier3 (x86_64-unknown-openbsd)	56s
tier3 (x86_64-unknown-haiku)	56s
cross (arm-unknown-linux-gnueabi)	1m 43s
redox	36s
cross (armv7-unknown-linux-gnueabihf)	1m 41s
cross_compiling (aarch64-linux-android)	34s
cross (i686-unknown-linux-gnu)	1m 40s
cross_compiling (arm-linux-androideabi)	31s
cross (i686-unknown-linux-musl)	1m 48s
cross_compiling (armv7-linux-androideabi)	30s
cross (mips-unknown-linux-gnu)	1m 42s
cross_compiling (i686-linux-android)	30s
cross (mips64-unknown-linux-gnuabi64)	1m 43s
cross_compiling (x86_64-linux-android)	29s
cross (mips64el-unknown-linux-gnuabi64)	1m 47s
cross_compiling (arm-unknown-linux-musleabi)	33s
cross (mipsel-unknown-linux-gnu)	1m 35s
cross_compiling (x86_64-unknown-fuchsia)	26s
cross (powerpc64le-unknown-linux-gnu)	1m 42s
cross_compiling (x86_64-unknown-illumos)	25s
cross_compiling (aarch64-apple-ios, true)	28s
cross_compiling (powerpc64-unknown-linux-gnu)	32s
cross_compiling (s390x-unknown-linux-gnu)	37s
cross_compiling (x86_64-unknown-linux-gnux32)	36s
cross_compiling (x86_64-unknown-netbsd)	30s
	37m 7s

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