net: moxa: Add spaces preferred around that '{+,-}'

This patch fixes all checkpatch occurences of
"CHECK: spaces preferred around that '{+,-}' (ctx:VxV)"
in moxart_ether code.
Signed-off-by: NSZ Lin <sz.lin@moxa.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/moxa/moxart_ether.h

@@ -55,17 +55,17 @@
 #define RX_DESC2_ADDRESS_VIRT	4
 
 #define TX_DESC_NUM		64
-#define TX_DESC_NUM_MASK	(TX_DESC_NUM-1)
+#define TX_DESC_NUM_MASK	(TX_DESC_NUM - 1)
 #define TX_NEXT(N)		(((N) + 1) & (TX_DESC_NUM_MASK))
 #define TX_BUF_SIZE		1600
-#define TX_BUF_SIZE_MAX		(TX_DESC1_BUF_SIZE_MASK+1)
+#define TX_BUF_SIZE_MAX		(TX_DESC1_BUF_SIZE_MASK + 1)
 #define TX_WAKE_THRESHOLD	16
 
 #define RX_DESC_NUM		64
-#define RX_DESC_NUM_MASK	(RX_DESC_NUM-1)
+#define RX_DESC_NUM_MASK	(RX_DESC_NUM - 1)
 #define RX_NEXT(N)		(((N) + 1) & (RX_DESC_NUM_MASK))
 #define RX_BUF_SIZE		1600
-#define RX_BUF_SIZE_MAX		(RX_DESC1_BUF_SIZE_MASK+1)
+#define RX_BUF_SIZE_MAX		(RX_DESC1_BUF_SIZE_MASK + 1)
 
 #define REG_INTERRUPT_STATUS	0
 #define REG_INTERRUPT_MASK	4