memleak in getoid

```
==2193893==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 266 byte(s) in 22 object(s) allocated from:
    #0 0x510134 in strdup /src/llvm-project/compiler-rt/lib/asan/asan_interceptors.cpp:452:3
    #1 0x570bfc in getoid /src/net-snmp/snmplib/parse.c:1898:25
    #2 0x56b904 in parse_objectid /src/net-snmp/snmplib/parse.c:1964:19
    #3 0x56c58e in parse_asntype /src/net-snmp/snmplib/parse.c:2322:14
    #4 0x564213 in parse /src/net-snmp/snmplib/parse.c:4582:19
    #5 0x55cfa3 in read_module_internal /src/net-snmp/snmplib/parse.c:3926:18
    #6 0x55cc89 in netsnmp_read_module /src/net-snmp/snmplib/parse.c:4025:14
    #7 0x560f05 in read_mib /src/net-snmp/snmplib/parse.c:5028:12
    #8 0x55869f in LLVMFuzzerTestOneInput /src/net-snmp/./testing/fuzzing/snmp_mib_fuzzer.c:71:5
    #9 0x45d623 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599:15
    #10 0x448d92 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323:6
    #11 0x44ea5e in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856:9
    #12 0x478512 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
    #13 0x7f789f264b26 in __libc_start_main /usr/src/debug/glibc-2.28/csu/../csu/libc-start.c:308

DEDUP_TOKEN: strdup--getoid--parse_objectid
SUMMARY: AddressSanitizer: 266 byte(s) leaked in 22 allocation(s).
```

src-openEuler/net-snmp

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