dell-wmi: fix a memory leak

If dell_new_hk_type is true, dell_legacy_wmi_keymap will point to a memory
allocated in setup_new_hk_map().
In this case, the memory is not freed in current implementation.
This patch fixes the leak by kfree(dell_wmi_keymap) if dell_new_hk_type is true.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

drivers/platform/x86/dell-wmi.c

@@ -339,13 +339,18 @@ static int __init dell_wmi_init(void)
 	acpi_video = acpi_video_backlight_support();
 
 	err = dell_wmi_input_setup();
-	if (err)
+	if (err) {
+		if (dell_new_hk_type)
+			kfree(dell_wmi_keymap);
 		return err;
+	}
 
 	status = wmi_install_notify_handler(DELL_EVENT_GUID,
 					 dell_wmi_notify, NULL);
 	if (ACPI_FAILURE(status)) {
 		input_unregister_device(dell_wmi_input_dev);
+		if (dell_new_hk_type)
+			kfree(dell_wmi_keymap);
 		printk(KERN_ERR
 			"dell-wmi: Unable to register notify handler - %d\n",
 			status);
@@ -359,6 +364,8 @@ static void __exit dell_wmi_exit(void)
 {
 	wmi_remove_notify_handler(DELL_EVENT_GUID);
 	input_unregister_device(dell_wmi_input_dev);
+	if (dell_new_hk_type)
+		kfree(dell_wmi_keymap);
 }
 
 module_init(dell_wmi_init);