driver core: platform: removed unneeded variable from __platform_driver_probe()

In the reworking of the function __platform_driver_probe() over the
years, it turns out that the variable 'code' does not actually do
anything or mean anything anymore and can be removed to simplify the
logic when trying to read and understand what this function is actually
doing.

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Link: https://lore.kernel.org/r/20230131082459.301603-1-gregkh@linuxfoundation.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/platform.c

@@ -906,7 +906,7 @@ static int platform_probe_fail(struct platform_device *pdev)
 int __init_or_module __platform_driver_probe(struct platform_driver *drv,
 		int (*probe)(struct platform_device *), struct module *module)
 {
-	int retval, code;
+	int retval;
 
 	if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) {
 		pr_err("%s: drivers registered with %s can not be probed asynchronously\n",
@@ -932,7 +932,7 @@ int __init_or_module __platform_driver_probe(struct platform_driver *drv,
 
 	/* temporary section violation during probe() */
 	drv->probe = probe;
-	retval = code = __platform_driver_register(drv, module);
+	retval = __platform_driver_register(drv, module);
 	if (retval)
 		return retval;
 
@@ -944,11 +944,11 @@ int __init_or_module __platform_driver_probe(struct platform_driver *drv,
 	 */
 	spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
 	drv->probe = platform_probe_fail;
-	if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
+	if (list_empty(&drv->driver.p->klist_devices.k_list))
 		retval = -ENODEV;
 	spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
 
-	if (code != retval)
+	if (retval)
 		platform_driver_unregister(drv);
 	return retval;
 }