GCC does not like passing NULL (__null) to std::ostringstream::operator<<
inside of ATF_REQUIRE_EQ:
lib/libc/tests/net/inet_net_test.cc: In member function 'virtual void {anonymous}::atfu_tc_inet_net_ntop_invalid::body() const':
lib/libc/tests/net/inet_net_test.cc:306:9: error: passing NULL to non-pointer argument 1 of 'std::__1::basic_ostream<_CharT, _Traits>& std::__1::basic_ostream<_CharT, _Traits>::operator<<(long int) [with _CharT = char; _Traits = std::__1::char_traits<char>]' [-Werror=conversion-null]
306 | ATF_REQUIRE_EQ(ret, NULL);
| ^~~~~~~~~~~~~~
In file included from /usr/obj/.../amd64.amd64/tmp/usr/include/c++/v1/sstream:317,
from /usr/obj/.../amd64.amd64/tmp/usr/include/atf-c++/macros.hpp:29,
from /usr/obj/.../amd64.amd64/tmp/usr/include/atf-c++.hpp:29,
from lib/libc/tests/net/inet_net_test.cc:33:
/usr/obj/.../amd64.amd64/tmp/usr/include/c++/v1/__ostream/basic_ostream.h:338:81: note: declared here
338 | basic_ostream<_CharT, _Traits>& basic_ostream<_CharT, _Traits>::operator<<(long __n) {
| ~~~~~^~~
...
Fixes: 8f4a0d2f7b ("libc: Import OpenBSD's inet_net_{ntop,pton}")
aa358ce3ca