MFC r340375 (by jch@):

cxgbe/netmap: Fix cxgbe netmap when interface is DOWN

A kernel panic can occur if the cxgbe interface is DOWN
when activating netmap. This patch prevents the driver
from freeing up cxgbe netmap resources when they have not
been allocated.

Submitted by: Nicolas Witkowski <nwitkowski@verisign.com>
Reviewed by: np
Sponsored by: Verisign, Inc.
Differential Revision: https://reviews.freebsd.org/D17802