named-pipes: fix receiving IOCP events after deregister #396

Job	Run time
Docs	7s
Clippy	8s
CheckTargets	1m 33s
Check (aarch64-apple-ios)	44s
Check (aarch64-apple-tvos)	33s
MinimalVersions (ubuntu-latest)	20s
Check (aarch64-unknown-openbsd)	46s
MSRV (ubuntu-latest)	11s
MinimalVersions (macos-latest)	36s
Nightly	21s
Check (arm64_32-apple-watchos)	29s
MSRV (macos-latest)	30s
Check (armv7-sony-vita-newlibeabihf)	35s
MinimalVersions (windows-latest)	43s
MSRV (windows-latest)	35s
Check (sparcv9-sun-solaris)	29s
Rustfmt	8s
Check (x86_64-pc-solaris)	32s
Check (x86_64-unknown-dragonfly)	34s
Sanitizer (address)	1m 2s
Test (ubuntu-latest)	42s
Check (x86_64-unknown-openbsd)	31s
Sanitizer (leak)	59s
Test (macos-latest)	1m 1s
TestPoll	27s
Test (windows-latest)	2m 3s
Sanitizer (memory)	1m 47s
Sanitizer (thread)	54s
TestWakerPipe	27s
Passed	1s
	19m 48s

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