[NET]: Remove unused member of dst_entry

The info placeholder member of dst_entry seems to be unused in the
network stack.
Signed-off-by: Rami Rosen <ramirose@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/dst.h

@@ -80,7 +80,6 @@ struct dst_entry
 		struct rt6_info   *rt6_next;
 		struct dn_route  *dn_next;
 	};
-	char			info[0];
 };