net/mlx5e: hide an unused variable

The uplink_rpriv variable was added at the start of the function but
only used inside of an #ifdef:

drivers/net/ethernet/mellanox/mlx5/core/en_tc.c: In function 'mlx5e_route_lookup_ipv6':
drivers/net/ethernet/mellanox/mlx5/core/en_tc.c:1549:25: error: unused variable 'uplink_rpriv' [-Werror=unused-variable]

This moves the declaration into that #ifdef as well.

Fixes: 5ed99fb421d4 ("net/mlx5e: Move ethernet representors data into separate struct")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -1546,11 +1546,11 @@ static int mlx5e_route_lookup_ipv6(struct mlx5e_priv *priv,
 				   struct neighbour **out_n,
 				   int *out_ttl)
 {
-	struct mlx5e_rep_priv *uplink_rpriv;
 	struct neighbour *n = NULL;
 	struct dst_entry *dst;
 
 #if IS_ENABLED(CONFIG_INET) && IS_ENABLED(CONFIG_IPV6)
+	struct mlx5e_rep_priv *uplink_rpriv;
 	struct mlx5_eswitch *esw = priv->mdev->priv.eswitch;
 	int ret;