tg3: Avoid the use of one-element array

One-element arrays are being deprecated[1]. Replace the one-element
array with a simple value type 'u32 reserved2'[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: kernel test robot <lkp@intel.com>
Link: https://github.com/GustavoARSilva/linux-hardening/blob/master/cii/0-day/tg3-20200718.mdSigned-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/tg3.h

@@ -2847,7 +2847,7 @@ struct tg3_ocir {
 	u32				port1_flags;
 	u32				port2_flags;
 	u32				port3_flags;
-	u32				reserved2[1];
+	u32				reserved2;
 };