platform/x86: intel_ips: remove unnecessary checks in ips_debugfs_init

As Greg KH explained in:
https://lkml.org/lkml/2015/8/15/114

There no need to check the return value of debugfs_create_file() and
debugfs_create_dir().

This also fix static code checker warnings:

drivers/platform/x86/intel_ips.c:1314
 ips_debugfs_init() warn: passing zero to 'PTR_ERR'
drivers/platform/x86/intel_ips.c:1328
 ips_debugfs_init() warn: passing zero to 'PTR_ERR'
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/platform/x86/intel_ips.c

@@ -1310,32 +1310,15 @@ static void ips_debugfs_init(struct ips_driver *ips)
 	int i;
 
 	ips->debug_root = debugfs_create_dir("ips", NULL);
-	if (!ips->debug_root) {
-		dev_err(ips->dev, "failed to create debugfs entries: %ld\n",
-			PTR_ERR(ips->debug_root));
-		return;
-	}
 
 	for (i = 0; i < ARRAY_SIZE(ips_debug_files); i++) {
-		struct dentry *ent;
 		struct ips_debugfs_node *node = &ips_debug_files[i];
 
 		node->ips = ips;
-		ent = debugfs_create_file(node->name, S_IFREG | S_IRUGO,
-					  ips->debug_root, node,
-					  &ips_debugfs_ops);
-		if (!ent) {
-			dev_err(ips->dev, "failed to create debug file: %ld\n",
-				PTR_ERR(ent));
-			goto err_cleanup;
-		}
+		debugfs_create_file(node->name, S_IFREG | S_IRUGO,
+				    ips->debug_root, node,
+				    &ips_debugfs_ops);
 	}
-
-	return;
-
-err_cleanup:
-	ips_debugfs_cleanup(ips);
-	return;
 }
 #endif /* CONFIG_DEBUG_FS */