r299215: buildkernel fails due to error: declaration of 'struct cpl_set_tcb_rpl' (cxgbe)

On CURRENT (r 299215), buildkernel fails due to an error in cxgbe:

[...]
In file included
from /usr/src/sys/modules/cxgbe/iw_cxgbe/../../../dev/cxgbe/iw_cxgbe/cm.c:62: /usr/src/sys/modules/cxgbe/iw_cxgbe/../../../dev/cxgbe/tom/t4_tom.h:349:55:
error: declaration of 'struct cpl_set_tcb_rpl' will not be visible outside of this
function [-Werror,-Wvisibility] void handle_ddp_tcb_rpl(struct toepcb *, const struct
cpl_set_tcb_rpl *);