net/mlx5: fix missing mutex_unlock in mlx5_fw_fatal_reporter_err_work()

commit 90e7cb78 upstream.

Add missing mutex_unlock() before returning from
mlx5_fw_fatal_reporter_err_work().

Fixes: 9078e843 ("net/mlx5: Avoid recovery in probe flows")
Reported-by: Nkernel test robot <lkp@intel.com>
Reported-by: NDan Carpenter <error27@gmail.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NShay Drory <shayd@nvidia.com>
Signed-off-by: NSaeed Mahameed <saeedm@nvidia.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/net/ethernet/mellanox/mlx5/core/health.c

@@ -677,6 +677,7 @@ static void mlx5_fw_fatal_reporter_err_work(struct work_struct *work)
 	mutex_lock(&dev->intf_state_mutex);
 	if (test_bit(MLX5_DROP_NEW_HEALTH_WORK, &health->flags)) {
 		mlx5_core_err(dev, "health works are not permitted at this stage\n");
+		mutex_unlock(&dev->intf_state_mutex);
 		return;
 	}
 	mutex_unlock(&dev->intf_state_mutex);