cxgb4: Fix endian bug introduced in cxgb4 dcb patchset

Hi,
 This patch fixes warnings generated by sparse as pointed out by kbuild test
 robot, please apply to net-next. Applies on top of
commit 79631c89ed70643fd0579a65834b227795b251ee ("trivial: net/irda/irlmp.c:
Fix closing brace followed by if")
-Anish

v2: cleanup submission as per davem's feedback

Fixes: 76bcb31efc06 ("cxgb4 : Add DCBx support codebase  and dcbnl_ops")
Signed-off-by: Anish Bhatt <anish@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>