net/mlx5: fs, fix RDMA TRANSPORT init cleanup flow

Failing during the initialization of root_namespace didn't cleanup
the priorities of the namespace on which the failure occurred.

Properly cleanup said priorities on failure.

Fixes: 52931f55 ("net/mlx5: fs, add multiple prios to RDMA TRANSPORT steering domain")
Signed-off-by: Patrisious Haddad <phaddad@nvidia.com>
Link: https://patch.msgid.link/78cf89b5d8452caf1e979350b30ada6904362f66.1751451780.git.leon@kernel.org


Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Leon Romanovsky <leon@kernel.org>