New local variable "struct flow_block_offload *f" was added to
mlx5e_setup_tc() in recent rtnl lock removal patches. The variable is used
in code that is only compiled when CONFIG_MLX5_ESWITCH is enabled. This
results compilation warning about unused variable when CONFIG_MLX5_ESWITCH
is not set. Move the variable definition into eswitch-specific code block
from the begging of mlx5e_setup_tc() function.

Fixes: c9f14470d048 ("net: sched: add API for registering unlocked offload 
block callbacks")
Reported-by: tanhuazhong <tanhuazh...@huawei.com>
Signed-off-by: Vlad Buslov <vla...@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c 
b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 8592b98d0e70..c10a1fc8e469 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -3470,16 +3470,18 @@ static int mlx5e_setup_tc(struct net_device *dev, enum 
tc_setup_type type,
                          void *type_data)
 {
        struct mlx5e_priv *priv = netdev_priv(dev);
-       struct flow_block_offload *f = type_data;
 
        switch (type) {
 #ifdef CONFIG_MLX5_ESWITCH
-       case TC_SETUP_BLOCK:
+       case TC_SETUP_BLOCK: {
+               struct flow_block_offload *f = type_data;
+
                f->unlocked_driver_cb = true;
                return flow_block_cb_setup_simple(type_data,
                                                  &mlx5e_block_cb_list,
                                                  mlx5e_setup_tc_block_cb,
                                                  priv, priv, true);
+       }
 #endif
        case TC_SETUP_QDISC_MQPRIO:
                return mlx5e_setup_tc_mqprio(priv, type_data);
-- 
2.21.0

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