net/mlx5: Delete unused FPGA QPN variable

stable inclusion
from linux-4.19.99
commit 9cef92d809914c64025fe8a47af9d6a2bce35e43

--------------------------------

[ Upstream commit 56642837 ]

fpga_qpn was assigned but never used and compilation with W=1
produced the following warning:

drivers/net/ethernet/mellanox/mlx5/core/fpga/core.c: In function _mlx5_fpga_event_:
drivers/net/ethernet/mellanox/mlx5/core/fpga/core.c:320:6: warning:
variable _fpga_qpn_ set but not used [-Wunused-but-set-variable]
  u32 fpga_qpn;
      ^~~~~~~~

Fixes: 98db16ba ("net/mlx5: FPGA, Handle QP error event")
Signed-off-by: NLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: NSaeed Mahameed <saeedm@mellanox.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NLi Aichun <liaichun@huawei.com>
Reviewed-by: Nguodeqing <geffrey.guo@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/net/ethernet/mellanox/mlx5/core/fpga/core.c

@@ -289,7 +289,6 @@ void mlx5_fpga_event(struct mlx5_core_dev *mdev, u8 event, void *data)
 	const char *event_name;
 	bool teardown = false;
 	unsigned long flags;
-	u32 fpga_qpn;
 	u8 syndrome;
 
 	switch (event) {
@@ -300,7 +299,6 @@ void mlx5_fpga_event(struct mlx5_core_dev *mdev, u8 event, void *data)
 	case MLX5_EVENT_TYPE_FPGA_QP_ERROR:
 		syndrome = MLX5_GET(fpga_qp_error_event, data, syndrome);
 		event_name = mlx5_fpga_qp_syndrome_to_string(syndrome);
-		fpga_qpn = MLX5_GET(fpga_qp_error_event, data, fpga_qpn);
 		break;
 	default:
 		mlx5_fpga_warn_ratelimited(fdev, "Unexpected event %u\n",