com20020: Fix allyesconfig build failure.
Reported by Stephen Rothwell.
Due to missing 'extern' in the com20020_netdev_ops declaration,
each file that includes linux/com20020.h gets another copy
defined in it's resulting object file.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/com20020.h b/include/linux/com20020.h
index 350afa7..5dcfb94 100644
--- a/include/linux/com20020.h
+++ b/include/linux/com20020.h
@@ -29,7 +29,7 @@
int com20020_check(struct net_device *dev);
int com20020_found(struct net_device *dev, int shared);
-const struct net_device_ops com20020_netdev_ops;
+extern const struct net_device_ops com20020_netdev_ops;
/* The number of low I/O ports used by the card. */
#define ARCNET_TOTAL_SIZE 8