btrfs: qgroup: use goto style to handle errors in add_delayed_ref()

Clean up resources using goto to get rid of repeated code.
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Junchao Sun <sunjunchao2870@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/delayed-ref.c

@@ -1005,18 +1005,13 @@ static int add_delayed_ref(struct btrfs_trans_handle *trans,
 		return -ENOMEM;
 
 	head_ref = kmem_cache_alloc(btrfs_delayed_ref_head_cachep, GFP_NOFS);
-	if (!head_ref) {
-		kmem_cache_free(btrfs_delayed_ref_node_cachep, node);
-		return -ENOMEM;
-	}
+	if (!head_ref)
+		goto free_node;
 
 	if (btrfs_qgroup_full_accounting(fs_info) && !generic_ref->skip_qgroup) {
 		record = kzalloc(sizeof(*record), GFP_NOFS);
-		if (!record) {
-			kmem_cache_free(btrfs_delayed_ref_node_cachep, node);
-			kmem_cache_free(btrfs_delayed_ref_head_cachep, head_ref);
-			return -ENOMEM;
-		}
+		if (!record)
+			goto free_head_ref;
 	}
 
 	init_delayed_ref_common(fs_info, node, generic_ref);
@@ -1052,6 +1047,12 @@ static int add_delayed_ref(struct btrfs_trans_handle *trans,
 	if (qrecord_inserted)
 		return btrfs_qgroup_trace_extent_post(trans, record);
 	return 0;
+
+free_head_ref:
+	kmem_cache_free(btrfs_delayed_ref_head_cachep, head_ref);
+free_node:
+	kmem_cache_free(btrfs_delayed_ref_node_cachep, node);
+	return -ENOMEM;
 }
 
 /*