mlxsw: core_thermal: Call thermal_zone_device_unregister() unconditionally

The function returns immediately if the thermal zone pointer is NULL so
there is no need to check it before calling the function.

Remove the check.
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Vadim Pasternak <vadimp@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Link: https://patch.msgid.link/0bd251aa8ce03d3c951983aa6b4300d8205b88a7.1722345311.git.petrm@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -821,10 +821,7 @@ int mlxsw_thermal_init(struct mlxsw_core *core,
 err_thermal_gearboxes_init:
 	mlxsw_thermal_modules_fini(thermal, &thermal->line_cards[0]);
 err_thermal_modules_init:
-	if (thermal->tzdev) {
-		thermal_zone_device_unregister(thermal->tzdev);
-		thermal->tzdev = NULL;
-	}
+	thermal_zone_device_unregister(thermal->tzdev);
 err_thermal_zone_device_register:
 err_thermal_cooling_device_register:
 	for (i = 0; i < MLXSW_MFCR_PWMS_MAX; i++)
@@ -845,10 +842,7 @@ void mlxsw_thermal_fini(struct mlxsw_thermal *thermal)
 					     thermal);
 	mlxsw_thermal_gearboxes_fini(thermal, &thermal->line_cards[0]);
 	mlxsw_thermal_modules_fini(thermal, &thermal->line_cards[0]);
-	if (thermal->tzdev) {
-		thermal_zone_device_unregister(thermal->tzdev);
-		thermal->tzdev = NULL;
-	}
+	thermal_zone_device_unregister(thermal->tzdev);
 
 	for (i = 0; i < MLXSW_MFCR_PWMS_MAX; i++)
 		thermal_cooling_device_unregister(thermal->cdevs[i].cdev);