sis900: use IS_ENABLED() instead of checking for built-in or module

The IS_ENABLED() macro checks if a Kconfig symbol has been enabled either
built-in or as a module, use that macro instead of open coding the same.

Using the macro makes the code more readable by helping abstract away some
of the Kconfig built-in and module enable details.
Signed-off-by: NJavier Martinez Canillas <javier@osg.samsung.com>
Acked-by: NDaniele Venzano <venza@brownhat.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/sis/sis900.c

@@ -1426,7 +1426,7 @@ static void sis900_set_mode(struct sis900_private *sp, int speed, int duplex)
 		rx_flags |= RxATX;
 	}
 
-#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
+#if IS_ENABLED(CONFIG_VLAN_8021Q)
 	/* Can accept Jumbo packet */
 	rx_flags |= RxAJAB;
 #endif
@@ -1750,7 +1750,7 @@ static int sis900_rx(struct net_device *net_dev)
 		data_size = rx_status & DSIZE;
 		rx_size = data_size - CRC_SIZE;
 
-#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
+#if IS_ENABLED(CONFIG_VLAN_8021Q)
 		/* ``TOOLONG'' flag means jumbo packet received. */
 		if ((rx_status & TOOLONG) && data_size <= MAX_FRAME_SIZE)
 			rx_status &= (~ ((unsigned int)TOOLONG));

drivers/net/ethernet/sis/sis900.h

@@ -310,7 +310,7 @@ enum sis630_revision_id {
 #define CRC_SIZE                4
 #define MAC_HEADER_SIZE         14
 
-#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
+#if IS_ENABLED(CONFIG_VLAN_8021Q)
 #define MAX_FRAME_SIZE  (1518 + 4)
 #else
 #define MAX_FRAME_SIZE  1518