Fix signed/unsigned comparison warnings.

--- lib/libc/rpc/svc_dg.c.orig	Mon Jan  6 10:47:17 2003
+++ lib/libc/rpc/svc_dg.c	Mon Jan  6 17:26:37 2003
@@ -181,7 +181,7 @@
 	struct sockaddr_storage ss;
 	socklen_t alen;
 	size_t replylen;
-	int rlen;
+	ssize_t rlen;
 
 again:
 	alen = sizeof (struct sockaddr_storage);
@@ -189,7 +189,7 @@
 	    (struct sockaddr *)(void *)&ss, &alen);
 	if (rlen == -1 && errno == EINTR)
 		goto again;
-	if (rlen == -1 || (rlen < 4 * sizeof (u_int32_t)))
+	if (rlen == -1 || (rlen < (ssize_t)(4 * sizeof (u_int32_t))))
 		return (FALSE);
 	if (xprt->xp_rtaddr.len < alen) {
 		if (xprt->xp_rtaddr.len != 0)
@@ -237,7 +237,7 @@
 		slen = XDR_GETPOS(xdrs);
 		if (_sendto(xprt->xp_fd, rpc_buffer(xprt), slen, 0,
 		    (struct sockaddr *)xprt->xp_rtaddr.buf,
-		    (socklen_t)xprt->xp_rtaddr.len) == slen) {
+		    (socklen_t)xprt->xp_rtaddr.len) == (ssize_t) slen) {
 			stat = TRUE;
 			if (su->su_cache)
 				cache_set(xprt, slen);