fuzz-netdev-parser: add test case for earlier version of preceding patches

fuzz-netdev-parser: add test case for earlier version of preceding patches

AddressSanitizer:DEADLYSIGNAL
=================================================================
==12==ERROR: AddressSanitizer: ABRT on unknown address 0x00000000000c (pc 0x7f0a518b3428 bp 0x7fffa463bfd0 sp 0x7fffa463be68 T0)
SCARINESS: 10 (signal)
    #0 0x7f0a518b3428 in raise (/lib/x86_64-linux-gnu/libc.so.6+0x35428)
    #1 0x7f0a518b5029 in abort (/lib/x86_64-linux-gnu/libc.so.6+0x37029)
    #2 0x7f0a52ca635a in log_assert_failed_realm /work/build/../../src/systemd/src/basic/log.c:819:9
    #3 0x4eea92 in config_parse_wireguard_endpoint /work/build/../../src/systemd/src/network/netdev/wireguard.c:808:9
    #4 0x7f0a52b2f74e in next_assignment /work/build/../../src/systemd/src/shared/conf-parser.c:133:32
    #5 0x7f0a52b2954e in parse_line /work/build/../../src/systemd/src/shared/conf-parser.c:242:16
    #6 0x7f0a52b28911 in config_parse /work/build/../../src/systemd/src/shared/conf-parser.c:377:21
    #7 0x7f0a52b29ec6 in config_parse_many_files /work/build/../../src/systemd/src/shared/conf-parser.c:439:21
    #8 0x7f0a52b2a5a6 in config_parse_many /work/build/../../src/systemd/src/shared/conf-parser.c:507:16
    #9 0x4d8d6c in netdev_load_one /work/build/../../src/systemd/src/network/netdev/netdev.c:732:13
    #10 0x4d3e2b in LLVMFuzzerTestOneInput /work/build/../../src/systemd/src/network/fuzz-netdev-parser.c:23:16
    #11 0x6b3266 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/libfuzzer/FuzzerLoop.cpp:558:15
    #12 0x6af860 in fuzzer::Fuzzer::RunOne(unsigned char const*, unsigned long, bool, fuzzer::InputInfo*, bool*) /src/libfuzzer/FuzzerLoop.cpp:470:3
    #13 0x6b6970 in fuzzer::Fuzzer::ReadAndExecuteSeedCorpora(std::__1::vector<fuzzer::SizedFile, fuzzer::fuzzer_allocator<fuzzer::SizedFile> >&) /src/libfuzzer/FuzzerLoop.cpp:770:7
    #14 0x6b7376 in fuzzer::Fuzzer::Loop(std::__1::vector<fuzzer::SizedFile, fuzzer::fuzzer_allocator<fuzzer::SizedFile> >&) /src/libfuzzer/FuzzerLoop.cpp:799:3
    #15 0x67573f in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/libfuzzer/FuzzerDriver.cpp:846:6
    #16 0x667097 in main /src/libfuzzer/FuzzerMain.cpp:19:10
    #17 0x7f0a5189e82f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #18 0x4295a8 in _start (out/fuzz-netdev-parser+0x4295a8)

DEDUP_TOKEN: raise--abort--log_assert_failed_realm
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: ABRT (/lib/x86_64-linux-gnu/libc.so.6+0x35428) in raise
==12==ABORTING