net/mlx5e: Remove unneeded semicolon

Fixes coccicheck warning:

drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c:690:2-3: Unneeded semicolon

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zheng Bin <zhengbin13@huawei.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>