mlxsw: minimal: fix potential memory leak in mlxsw_m_linecards_init

The line cards array is not freed in the error path of
mlxsw_m_linecards_init(), which can lead to a memory leak. Fix by
freeing the array in the error path, thereby making the error path
identical to mlxsw_m_linecards_fini().

Fixes: 01328e2 ("mlxsw: minimal: Extend module to port mapping with slot index")
Signed-off-by: Zhengchao Shao <[email protected]>
Reviewed-by: Petr Machata <[email protected]>
Reviewed-by: Ido Schimmel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Orabug: 35622106

(cherry picked from commit 08fc757)
cherry-pick-repo=kernel/git/torvalds/linux.git
unmodified-from-upstream: 08fc757

Signed-off-by: Mikhael Goikhman <[email protected]>
Signed-off-by: Qing Huang <[email protected]>
Reviewed-by: Devesh Sharma <[email protected]>
Signed-off-by: Brian Maly <[email protected]>

Author: zhengchaoshao

drivers/net/ethernet/mellanox/mlxsw/minimal.c

@@ -417,6 +417,7 @@ static int mlxsw_m_linecards_init(struct mlxsw_m *mlxsw_m)
 err_kmalloc_array:
 	for (i--; i >= 0; i--)
 		kfree(mlxsw_m->line_cards[i]);
+	kfree(mlxsw_m->line_cards);
 err_kcalloc:
 	kfree(mlxsw_m->ports);
 	return err;