net/mlx5e: Use ethtool_sprintf/puts() to fill priv flags strings

Use ethtool_sprintf/puts() helper functions which handle the common
pattern of printing a string into the ethtool strings interface and
incrementing the string pointer by ETH_GSTRING_LEN.
Signed-off-by: Gal Pressman <gal@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240402133043.56322-2-tariqt@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -269,8 +269,7 @@ void mlx5e_ethtool_get_strings(struct mlx5e_priv *priv, u32 stringset, u8 *data)
 	switch (stringset) {
 	case ETH_SS_PRIV_FLAGS:
 		for (i = 0; i < MLX5E_NUM_PFLAGS; i++)
-			strcpy(data + i * ETH_GSTRING_LEN,
-			       mlx5e_priv_flags[i].name);
+			ethtool_puts(&data, mlx5e_priv_flags[i].name);
 		break;
 
 	case ETH_SS_TEST: