Reuse existing native pointer rather than allocating a new one in getnameinfo()

Author: eregon

lib/truffle/socket/truffle/foreign.rb

@@ -208,7 +208,7 @@ def self.getnameinfo(sockaddr, flags = ::Socket::NI_NUMERICHOST | ::Socket::NI_N
 
               raise SocketError, gai_strerror(err) unless err == 0
 
-              sa_family = SockaddrIn.with_sockaddr(sockaddr)[:sin_family]
+              sa_family = SockaddrIn.new(sockaddr_p)[:sin_family]
 
               name_info[0] = ::Socket::Constants::AF_TO_FAMILY[sa_family]
               name_info[1] = service.read_string