net/mlx5e: Initialize link speed to zero

mlx5e_port_max_linkspeed does not guarantee value assignment for speed.
Avoid cases where link_speed might be used uninitialized. In case
mlx5e_port_max_linkspeed fails, a default link speed of 50000 will be
used for the calculations.

Fixes: 3f6d08d ("net/mlx5e: Add RSS support for hairpin")
Signed-off-by: Roy Novich <royno@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Aya Levin <ayal@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

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

@@ -1103,8 +1103,8 @@ static void
 mlx5e_hairpin_params_init(struct mlx5e_hairpin_params *hairpin_params,
 			  struct mlx5_core_dev *mdev)
 {
+	u32 link_speed = 0;
 	u64 link_speed64;
-	u32 link_speed;
 
 	hairpin_params->mdev = mdev;
 	/* set hairpin pair per each 50Gbs share of the link */