Fix `UNIXSocket#receive` (#15107) #12607

Job	Run time
check_format	1m 35s
x86_64-gnu-test (1.7.3)	34m 33s
x86_64-gnu-test (1.8.2)	34m 9s
x86_64-musl-test	38m 4s
x86_64-gnu-test (1.9.2)	36m 18s
x86_64-gnu-test-preview_mt	5m 39s
x86_64-gnu-test (1.10.1)	34m 25s
x86_64-gnu-test (1.11.2)	32m 34s
x86_64-gnu-test (1.12.2)	36m 13s
x86_64-gnu-test (1.13.3)	33m 10s
x86_64-gnu-test (1.14.0)	33m 20s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	33m 13s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	35m 49s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	34m 45s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	34m 5s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	35m 6s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	35m 41s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	34m 6s
	9h 22m 45s

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