net/mlx5e: Replace recursive VLAN push handling with an iterative loop

net/mlx5e: Replace recursive VLAN push handling with an iterative loop

mlx5e_tc_act_vlan_add_push_action() uses tail-recursion to walk through
a stack of VLAN devices.

There is no need for a complicated recursion with unnecessary stack
consumption and less obvious code flow, rewrite the function so that it
uses a do while loop instead.

Signed-off-by: Gal Pressman <gal@nvidia.com>
Reviewed-by: Cosmin Ratiu <cratiu@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/1752009387-13300-4-git-send-email-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>