net/xfrm/xfrm_iptfs.c:33: warning: bad line: net/xfrm/xfrm_iptfs.c:42: warning: expecting prototype for IP(). Prototype was for IPTFS_DEFAULT_INIT_DELAY_USECS() instead net/xfrm/xfrm_iptfs.c:649: warning: No description found for return value of 'iptfs_get_inner_mtu' net/xfrm/xfrm_iptfs.c:33: warning: bad line: net/xfrm/xfrm_iptfs.c:42: warning: expecting prototype for IP(). Prototype was for IPTFS_DEFAULT_INIT_DELAY_USECS() instead