LeakSanitizer: Memory leak in hosted_at

[vadimpilyugin]

Describe the bug

LeakSanitizer detected a leak in httplib::hosted_at. This function uses getaddrinfo to get a list of addresses, but does not free the list afterwards. You should call freeaddrinfo(result) before returning from the function.

To reproduce

Compile with ASAN and make a call to httplib::hosted_at. You should be able to see a new leak in ASAN output

ASAN output

Direct leak of 64 byte(s) in 1 object(s) allocated from:
    #0 0x7fa9bcf61c47 in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:145
    #1 0x7fa9bca47c29  (/lib/x86_64-linux-gnu/libc.so.6+0x103c29)
    #2 0x7fa9bca49f88 in getaddrinfo (/lib/x86_64-linux-gnu/libc.so.6+0x105f88)
    #3 0x7fa9bcf3a6f6 in __interceptor_getaddrinfo ../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:2602
    #4 0x55e2ca29de00 in httplib::hosted_at(char const*, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&) vcpkg/installed/x64-linux-static/include/httplib.h:4357

[yhirose]

@vadimpilyugin, thanks a lot!