can: fix bfin_can build error after alloc_candev() change

Looks like commit a6e4bc530403 didn't include updates to drivers so the
Blackfin CAN driver fails to build now.

Signed-off-by: Barry Song <barry.song@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/can/bfin_can.c

@@ -26,6 +26,7 @@
 
 #define DRV_NAME "bfin_can"
 #define BFIN_CAN_TIMEOUT 100
+#define TX_ECHO_SKB_MAX  1
 
 /*
  * transmit and receive channels
@@ -593,7 +594,7 @@ struct net_device *alloc_bfin_candev(void)
 	struct net_device *dev;
 	struct bfin_can_priv *priv;
 
-	dev = alloc_candev(sizeof(*priv));
+	dev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX);
 	if (!dev)
 		return NULL;