lwcircstring direct leak in wkb parser

[komzpa]

=================================================================
==1==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 72 byte(s) in 3 object(s) allocated from:
    #0 0x49692d in malloc /src/llvm/projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
    #1 0x6616cb in ptarray_construct_empty /src/postgis/liblwgeom/ptarray.c:61:19
    #2 0x66165e in ptarray_construct /src/postgis/liblwgeom/ptarray.c:53:19
    #3 0x611060 in lwcircstring_from_wkb_state /src/postgis/liblwgeom/lwin_wkb.c:479:19
    #4 0x611a7b in lwcurvepoly_from_wkb_state /src/postgis/liblwgeom/lwin_wkb.c:619:10
    #5 0x611eda in lwgeom_from_wkb /src/postgis/liblwgeom/lwin_wkb.c:783:9
    #6 0x4c9d2d in LLVMFuzzerTestOneInput /src/postgis/fuzzers/wkb_import_fuzzer.cpp:116:22
    #7 0x51a546 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/libfuzzer/FuzzerLoop.cpp:556:15
    #8 0x4cb08f in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/libfuzzer/FuzzerDriver.cpp:292:6
    #9 0x4d8cf2 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/libfuzzer/FuzzerDriver.cpp:774:9
    #10 0x4ca6d7 in main /src/libfuzzer/FuzzerMain.cpp:19:10

[komzpa]

​https://oss-fuzz.com/testcase-detail/5708157145317376

[Algunenano]

PR: ​https://github.com/postgis/postgis/pull/492

[algunenano]

In 17892:

Fix leak in lwcurvepoly_from_wkb_state

Closes #4534
Closes ​https://github.com/postgis/postgis/pull/492

[algunenano]

In 17894:

Fix leak in lwcurvepoly_from_wkb_state

References #4534

[algunenano]

In 17895:

Fix leak in lwcurvepoly_from_wkb_state

References #4534

[algunenano]

In 17896:

Fix leak in lwcurvepoly_from_wkb_state

References #4534