[IPVS]: auto-help for ip_vs_ftp

Fill in a help message for the ports option to ip_vs_ftp
Signed-Off-By: Simon Horman <horms@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/ipvs/ip_vs_ftp.c

@@ -46,6 +46,7 @@
  */
 static int ports[IP_VS_APP_MAX_PORTS] = {21, 0};
 module_param_array(ports, int, NULL, 0);
+MODULE_PARM_DESC(ports, "Ports to monitor for FTP control commands");
 
 /*
  *	Debug level