bna: bfi.h: Avoid the use of one-element array

One-element arrays are being deprecated[1]. Replace the one-element
array with a simple value type 'u8 rsvd'[2], once it seems this is
just a placeholder for alignment.

[1] https://github.com/KSPP/linux/issues/79
[2] https://github.com/KSPP/linux/issues/86Tested-by: Nkernel test robot <lkp@intel.com>
Link: https://github.com/GustavoARSilva/linux-hardening/blob/master/cii/0-day/bfi-20200718.mdSigned-off-by: NGustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/brocade/bna/bfi.h

@@ -389,7 +389,7 @@ struct bfi_msgq_mhdr {
 	u16	msg_token;
 	u16	num_entries;
 	u8	enet_id;
-	u8	rsvd[1];
+	u8	rsvd;
 } __packed;
 
 #define bfi_msgq_mhdr_set(_mh, _mc, _mid, _tok, _enet_id) do {	\