Remove a check about whether sa->sa_len is equal to salen from

getnameinfo(3).  POSIX standard does not require a sa_len field
in sockaddr struct, hence such requirement will cause problem
for portability.

PR:		standards/80008
Requested by:	Xin Liu <lx@knight.6test.edu.cn>
Reviewed by:	freebsd-standards (das)
MFC After:	2 weeks

lib/libc/net/getnameinfo.c

@@ -109,8 +109,10 @@ getnameinfo(sa, salen, host, hostlen, serv, servlen, flags)
 	if (sa == NULL)
 		return EAI_FAIL;
 
+#ifdef BSD4_4
 	if (sa->sa_len != salen)
 		return EAI_FAIL;
+#endif
 
 	family = sa->sa_family;
 	for (i = 0; afdl[i].a_af; i++)