mlxsw: core_thermal: Remove unnecessary checks

mlxsw_thermal_module_fini() cannot be invoked with a thermal module
which is NULL or which is not associated with a thermal zone, so remove
these checks.
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/8db5fe0a3a28ba09a15d4102cc03f7e8ca7675be.1722345311.git.petrm@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -467,11 +467,9 @@ mlxsw_thermal_module_init(struct mlxsw_thermal *thermal,
 
 static void mlxsw_thermal_module_fini(struct mlxsw_thermal_module *module_tz)
 {
-	if (module_tz && module_tz->tzdev) {
-		mlxsw_thermal_module_tz_fini(module_tz->tzdev);
-		module_tz->tzdev = NULL;
-		module_tz->parent = NULL;
-	}
+	mlxsw_thermal_module_tz_fini(module_tz->tzdev);
+	module_tz->tzdev = NULL;
+	module_tz->parent = NULL;
 }
 
 static int