bpf: handle another corner case in getsockopt #20718

Job	Run time
set-matrix	1s
build for x86_64 with gcc	4m 45s
build for x86_64 with llvm-16	4m 24s
build for aarch64 with gcc	5m 21s
build for aarch64 with llvm-16	5m 11s
build for s390x with gcc	19m 36s
test_progs on x86_64 with gcc	5m 9s
test_progs_parallel on x86_64 with gcc	3m 34s
test_progs_no_alu32 on x86_64 with gcc	4m 14s
test_progs_no_alu32_parallel on x86_64 with gcc	3m 18s
test_maps on x86_64 with gcc	3m 43s
test_verifier on x86_64 with gcc	2m 41s
test_progs on x86_64 with llvm-16	5m 6s
test_progs_parallel on x86_64 with llvm-16	3m 48s
test_progs_no_alu32 on x86_64 with llvm-16	4m 15s
test_progs_no_alu32_parallel on x86_64 with llvm-16	3m 21s
test_maps on x86_64 with llvm-16	3m 28s
test_verifier on x86_64 with llvm-16	2m 39s
test_progs on aarch64 with gcc	5m 28s
test_progs_parallel on aarch64 with gcc	3m 47s
test_progs_no_alu32 on aarch64 with gcc	4m 40s
test_progs_no_alu32_parallel on aarch64 with gcc	3m 46s
test_maps on aarch64 with gcc	4m 6s
test_verifier on aarch64 with gcc	2m 47s
test_progs on aarch64 with llvm-16	5m 26s
test_progs_parallel on aarch64 with llvm-16	3m 43s
test_progs_no_alu32 on aarch64 with llvm-16	4m 45s
test_progs_no_alu32_parallel on aarch64 with llvm-16	3m 44s
test_maps on aarch64 with llvm-16	4m 9s
test_verifier on aarch64 with llvm-16	2m 50s
test_progs on s390x with gcc	20m 42s
test_progs_no_alu32 on s390x with gcc	13m 13s
test_maps on s390x with gcc	37m 10s
test_verifier on s390x with gcc	3m 32s
	3h 28m 22s

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