mlxsw: core_thermal: Simplify rollback

During rollback, instead of calling mlxsw_thermal_module_fini() for all
the modules, only call it for modules that were successfully
initialized. This is not a bug fix since mlxsw_thermal_module_fini()
first checks that the module was initialized.
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/905bebc45f6e246031f0c5c177bba8efe11e05f5.1722345311.git.petrm@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -509,7 +509,7 @@ mlxsw_thermal_modules_init(struct device *dev, struct mlxsw_core *core,
 	return 0;
 
 err_thermal_module_init:
-	for (i = area->tz_module_num - 1; i >= 0; i--)
+	for (i--; i >= 0; i--)
 		mlxsw_thermal_module_fini(&area->tz_module_arr[i]);
 	kfree(area->tz_module_arr);
 	return err;