IB/mlx4: Remove redundant attribute in mlx4_ib_create_qp_rss struct

rx_key_len is not in use and needs to be removed.

Fixes: 3078f5f ("IB/mlx4: Add support for RSS QP")
Signed-off-by: Guy Levi <guyle@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

include/uapi/rdma/mlx4-abi.h

@@ -98,8 +98,7 @@ struct mlx4_ib_create_srq_resp {
 struct mlx4_ib_create_qp_rss {
 	__u64   rx_hash_fields_mask;
 	__u8    rx_hash_function;
-	__u8    rx_key_len;
-	__u8    reserved[6];
+	__u8    reserved[7];
 	__u8    rx_hash_key[40];
 	__u32   comp_mask;
 	__u32   reserved1;