LSan: Fix memory leak of test_X509HostnameValidator

[masaori335]

===============================================================================
All tests passed (27 assertions in 5 test cases)

     Allocated      |   Allocated Count  |        In-Use      |    In-Use Count    | Type Size  | Chunk Size | HP Fails |   Free List Name
--------------------|--------------------|--------------------|--------------------|------------|------------|----------|----------------------------------
                  0 |                  0 |            | TOTAL
-----------------------------------------------------------------------------------------

=================================================================
==28635==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 352 byte(s) in 1 object(s) allocated from:
    #0 0x10aec84ad in wrap_malloc+0x9d (libclang_rt.asan_osx_dynamic.dylib:x86_64h+0xdf4ad) (BuildId: 7be29bc853af3228b5ae02c6da2408ac2400000010000000000a0a0000000d00)
    #1 0x10a78ec21 in CRYPTO_malloc+0x91 (libcrypto.1.1.dylib:x86_64+0x15cc21) (BuildId: e5b1f7be8de23d9b8660a3bf087a555932000000200000000100000000000d00)
    #2 0x10a78ec62 in CRYPTO_zalloc+0x22 (libcrypto.1.1.dylib:x86_64+0x15cc62) (BuildId: e5b1f7be8de23d9b8660a3bf087a555932000000200000000100000000000d00)
    #3 0x10a661bf6 in asn1_item_embed_new+0x2d6 (libcrypto.1.1.dylib:x86_64+0x2fbf6) (BuildId: e5b1f7be8de23d9b8660a3bf087a555932000000200000000100000000000d00)
    #4 0x10a66190e in ASN1_item_ex_new+0x1e (libcrypto.1.1.dylib:x86_64+0x2f90e) (BuildId: e5b1f7be8de23d9b8660a3bf087a555932000000200000000100000000000d00)
    #5 0x10a65da8c in asn1_item_embed_d2i+0x7ec (libcrypto.1.1.dylib:x86_64+0x2ba8c) (BuildId: e5b1f7be8de23d9b8660a3bf087a555932000000200000000100000000000d00)
    #6 0x10a65d273 in ASN1_item_ex_d2i+0x63 (libcrypto.1.1.dylib:x86_64+0x2b273) (BuildId: e5b1f7be8de23d9b8660a3bf087a555932000000200000000100000000000d00)
    #7 0x10a65d1e4 in ASN1_item_d2i+0x64 (libcrypto.1.1.dylib:x86_64+0x2b1e4) (BuildId: e5b1f7be8de23d9b8660a3bf087a555932000000200000000100000000000d00)
    #8 0x10a8446ab in d2i_X509+0x2b (libcrypto.1.1.dylib:x86_64+0x2126ab) (BuildId: e5b1f7be8de23d9b8660a3bf087a555932000000200000000100000000000d00)
    #9 0x10a7abdda in PEM_ASN1_read_bio+0x8a (libcrypto.1.1.dylib:x86_64+0x179dda) (BuildId: e5b1f7be8de23d9b8660a3bf087a555932000000200000000100000000000d00)
    #10 0x10a7ad82a in PEM_read_bio_X509+0x3a (libcrypto.1.1.dylib:x86_64+0x17b82a) (BuildId: e5b1f7be8de23d9b8660a3bf087a555932000000200000000100000000000d00)
    #11 0x1091221d0 in load_cert_from_string(char const*) test_X509HostnameValidator.cc:101
    #12 0x109077392 in C_A_T_C_H_T_E_S_T_2() test_X509HostnameValidator.cc:117
    #13 0x10903ab12 in Catch::TestInvokerAsFunction::invoke() const catch.hpp:14328
    #14 0x10902344e in Catch::TestCase::invoke() const catch.hpp:14167
    #15 0x10902323e in Catch::RunContext::invokeActiveTestCase() catch.hpp:13027
    #16 0x10901c938 in Catch::RunContext::runCurrentTest(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>&) catch.hpp:13000
    #17 0x10901a707 in Catch::RunContext::runTest(Catch::TestCase const&) catch.hpp:12761
    #18 0x10902af69 in Catch::(anonymous namespace)::TestGroup::execute() catch.hpp:13354
    #19 0x109029a06 in Catch::Session::runInternal() catch.hpp:13560
    #20 0x109029412 in Catch::Session::run() catch.hpp:13516
    #21 0x10907fc0a in main test_X509HostnameValidator.cc:181
    #22 0x7ff80261d41e in start+0x76e (dyld:x86_64+0xfffffffffff6e41e) (BuildId: 5db85b72c63a318291e55c942ec30e4832000000200000000100000000040d00)

[masaori335]

[approve ci centos]