src: fix crash in AfterGetAddrInfo

Remove invalid usage of `Check()`. This addresses:

    FATAL ERROR: v8::FromJust Maybe value is Nothing.
     1: 0x101311bf5 node::Abort() (.cold.1) [/Users/xxx/.nvm/versions/node/v14.17.4/bin/node]
     2: 0x1000ade29 node::Abort() [/Users/xxx/.nvm/versions/node/v14.17.4/bin/node]
     3: 0x1000adf8f node::OnFatalError(char const*, char const*) [/Users/xxx/.nvm/versions/node/v14.17.4/bin/node]
     4: 0x1001f42d0 v8::V8::FromJustIsNothing() [/Users/xxx/.nvm/versions/node/v14.17.4/bin/node]
     5: 0x1000268e2 node::cares_wrap::(anonymous namespace)::AfterGetAddrInfo(uv_getaddrinfo_s*, int, addrinfo*)::$_2::operator()(bool, bool) const [/Users/xxx/.nvm/versions/node/v14.17.4/bin/node]
     6: 0x10002657c node::cares_wrap::(anonymous namespace)::AfterGetAddrInfo(uv_getaddrinfo_s*, int, addrinfo*) [/Users/xxx/.nvm/versions/node/v14.17.4/bin/node]
     7: 0x1009fb388 uv__work_done [/Users/xxx/.nvm/versions/node/v14.17.4/bin/node]
     8: 0x100a00453 uv__async_io [/Users/xx...