Add missing return statement

sres_cached_answers_sockaddr is supposed to return ENOENT if no cached
records are found.  Because of the missing return statement, however,
it would never do this and would instead return something very likely
to be garbage.

libs/sofia-sip/libsofia-sip-ua/sresolv/sres.c

@@ -1372,7 +1372,7 @@ sres_cached_answers_sockaddr(sres_resolver_t *res,
     return NULL;
 
   if (!sres_cache_get(res->res_cache, type, name, &result))
-    su_seterrno(ENOENT), (void *)NULL;
+    return su_seterrno(ENOENT), (void *)NULL;
 
   return result;
 }