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c07f18ffd4
Fixes: oss-fuzz#22208
```
test/fuzz/fuzz-calendarspec/oss-fuzz-22208... ../src/shared/calendarspec.c:666:48: runtime error: signed integer overflow: 2147000000 + 1000000 cannot be represented in type 'int'
#0 0x7f0b9f6cc56a in prepend_component ../src/shared/calendarspec.c:666
#1 0x7f0b9f6cd03a in parse_chain ../src/shared/calendarspec.c:718
#2 0x7f0b9f6cea1c in parse_calendar_time ../src/shared/calendarspec.c:845
#3 0x7f0b9f6d1397 in calendar_spec_from_string ../src/shared/calendarspec.c:1084
#4 0x401570 in LLVMFuzzerTestOneInput ../src/fuzz/fuzz-calendarspec.c:17
#5 0x401ae0 in main ../src/fuzz/fuzz-main.c:39
#6 0x7f0b9e31b1a2 in __libc_start_main (/lib64/libc.so.6+0x271a2)
#7 0x40122d in _start (/home/fsumsal/repos/systemd/build/fuzz-calendarspec+0x40122d)
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ../src/shared/calendarspec.c:666:48 in
```
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| .. | ||
| fuzz-bus-message | ||
| fuzz-calendarspec | ||
| fuzz-catalog | ||
| fuzz-dhcp6-client | ||
| fuzz-dhcp-server | ||
| fuzz-dns-packet | ||
| fuzz-env-file | ||
| fuzz-fido-id-desc | ||
| fuzz-journal-remote | ||
| fuzz-journald-audit | ||
| fuzz-journald-kmsg | ||
| fuzz-journald-native-fd | ||
| fuzz-journald-stream | ||
| fuzz-journald-syslog | ||
| fuzz-json | ||
| fuzz-link-parser | ||
| fuzz-lldp | ||
| fuzz-ndisc-rs | ||
| fuzz-netdev-parser | ||
| fuzz-network-parser | ||
| fuzz-nspawn-oci | ||
| fuzz-nspawn-settings | ||
| fuzz-udev-database | ||
| fuzz-udev-rules | ||
| fuzz-unit-file | ||
| fuzz-varlink | ||
| .gitattributes | ||
| meson.build | ||