thinkpad_acpi: Fix a memory leak during module exit

We should free the thinkpad_id.nummodel_str during exit as it's allocated
in get_thinkpad_module_data().
Signed-off-by: NLi Dongyang <Jerry87905@gmail.com>
Signed-off-by: NMatthew Garrett <mjg@redhat.com>

drivers/platform/x86/thinkpad_acpi.c

@@ -8970,6 +8970,7 @@ static void thinkpad_acpi_module_exit(void)
 	kfree(thinkpad_id.bios_version_str);
 	kfree(thinkpad_id.ec_version_str);
 	kfree(thinkpad_id.model_str);
+	kfree(thinkpad_id.nummodel_str);
 }