The mutex was not unlocked on some of the error flows.
Moved the unlock location to include all the error flow scenarios.

Fixes: e1f4a52a ("RDMA/mlx5: Create an indirect flow table for steering anchor")
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Hamdan Igbaria <hamdani@nvidia.com>
Link: https://lore.kernel.org/r/1244a69d783da997c0af0b827c622eb00495492e.1695203958.git.leonro@nvidia.comSigned-off-by: Leon Romanovsky <leon@kernel.org>