netvsc: remove unused #define

Not used anywhere.
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/hyperv/hyperv_net.h

@@ -1427,9 +1427,6 @@ struct rndis_message {
 	((void *) rndis_msg)
 
 
-#define __struct_bcount(x)
-
-
 
 #define RNDIS_HEADER_SIZE	(sizeof(struct rndis_message) - \
 				 sizeof(union rndis_message_container))