Special-case CTL_ALIAS instead of CTL_DNS in udp loopback test.

At the same time remove a bogus test (tested by Jason Wessel).
Quiet some gcc4 warnings from slirp compilation.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4402 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/slirp/socket.c b/slirp/socket.c
index 0c15132..75003af 100644
--- a/slirp/socket.c
+++ b/slirp/socket.c
@@ -392,7 +392,7 @@
 	struct socket *so;
 {
 	struct sockaddr_in addr;
-	int addrlen = sizeof(struct sockaddr_in);
+	socklen_t addrlen = sizeof(struct sockaddr_in);
 
 	DEBUG_CALL("sorecvfrom");
 	DEBUG_ARG("so = %lx", (long)so);
@@ -545,7 +545,8 @@
 {
 	struct sockaddr_in addr;
 	struct socket *so;
-	int s, addrlen = sizeof(addr), opt = 1;
+	int s, opt = 1;
+	socklen_t addrlen = sizeof(addr);
 
 	DEBUG_CALL("solisten");
 	DEBUG_ARG("port = %d", port);