[IPV4] IPVS: fix the dependence of IP_VS_FTP in Kconfig

net/ipv4/ipvs/Kconfig

@@ -241,7 +241,7 @@ comment 'IPVS application helper'
 
 config	IP_VS_FTP
   	tristate "FTP protocol helper"
-        depends on IP_VS
+        depends on IP_VS && IP_VS_PROTO_TCP
 	---help---
 	  FTP is a protocol that transfers IP address and/or port number in
 	  the payload. In the virtual server via Network Address Translation,