platform/x86: dell-laptop: fix error return code in dell_init()

Fix to return error code -ENOMEM from the kzalloc() error handling
case instead of 0, as done elsewhere in this function.

Fixes: 549b4930 ("platform/x86: dell-smbios: Introduce dispatcher for SMM calls")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Mario Limonciello <mario.limonciello@dell.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/platform/x86/dell-laptop.c

@@ -2074,8 +2074,10 @@ static int __init dell_init(void)
 		goto fail_platform_device2;
 
 	buffer = kzalloc(sizeof(struct calling_interface_buffer), GFP_KERNEL);
-	if (!buffer)
+	if (!buffer) {
+		ret = -ENOMEM;
 		goto fail_buffer;
+	}
 
 
 	ret = dell_setup_rfkill();