[PATCH] Fix ip_nat_ftp registration when no ports= arg

FTP NAT module doesn't register anything with no args.  Oops.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

net/ipv4/netfilter/ip_nat_ftp.c

@@ -297,7 +297,7 @@ static int __init init(void)
 	char *tmpname;
 
 	if (ports_c == 0)
-		ports[ports_c] = FTP_PORT;
+		ports[ports_c++] = FTP_PORT;
 
 	for (i = 0; i < ports_c; i++) {
 		ftp[i].tuple.dst.protonum = IPPROTO_TCP;