convert hypfs

just have hypfs_create_file() do the usual simple_start_creating()/
d_make_persistent()/simple_done_creating() and that's it

Signed-off-by: Al Viro <[e-mail]>

arch/s390/hypfs/inode.c

···
 	struct hypfs_sb_info *sb_info = sb->s_fs_info;
 
 	hypfs_last_dentry = NULL;
-	kill_litter_super(sb);
+	kill_anon_super(sb);
 	kfree(sb_info);
 }
 
···
 	struct dentry *dentry;
 	struct inode *inode;
 
-	inode_lock(d_inode(parent));
-	dentry = lookup_noperm(&QSTR(name), parent);
-	if (IS_ERR(dentry)) {
-		dentry = ERR_PTR(-ENOMEM);
-		goto fail;
-	}
+	dentry = simple_start_creating(parent, name);
+	if (IS_ERR(dentry))
+		return ERR_PTR(-ENOMEM);
 	inode = hypfs_make_inode(parent->d_sb, mode);
 	if (!inode) {
-		dput(dentry);
-		dentry = ERR_PTR(-ENOMEM);
-		goto fail;
+		simple_done_creating(dentry);
+		return ERR_PTR(-ENOMEM);
 	}
 	if (S_ISREG(mode)) {
 		inode->i_fop = &hypfs_file_ops;
···
 	} else
 		BUG();
 	inode->i_private = data;
-	d_instantiate(dentry, inode);
-fail:
-	inode_unlock(d_inode(parent));
-	return dentry;
+	d_make_persistent(dentry, inode);
+	simple_done_creating(dentry);
+	return dentry;	 // borrowed
 }
 
 struct dentry *hypfs_mkdir(struct dentry *parent, const char *name)