net/mlx5: fix kfree mismatch in indir_table.c

Memory allocated by kvzalloc() should be freed by kvfree().

Fixes: 34ca6535 ("net/mlx5: E-Switch, Indirect table infrastructur")
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>