ipvs: use standardized format in sprintf

Use the same format string as net/ipv4/netfilter/nf_nat_ftp.c
to encode an ipv4 address and port.

Both uses should be a single common function.
Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Patrick McHardy <kaber@trash.net>

net/netfilter/ipvs/ip_vs_ftp.c

@@ -208,7 +208,7 @@ static int ip_vs_ftp_out(struct ip_vs_app *app, struct ip_vs_conn *cp,
 		 */
 		from.ip = n_cp->vaddr.ip;
 		port = n_cp->vport;
-		sprintf(buf, "%d,%d,%d,%d,%d,%d", NIPQUAD(from.ip),
+		sprintf(buf, "%u,%u,%u,%u,%u,%u", NIPQUAD(from.ip),
 			(ntohs(port)>>8)&255, ntohs(port)&255);
 		buf_len = strlen(buf);