hppfs: fix the leaks on close()

we need to close the underlying procfs file and free ->private_data

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/hppfs/hppfs.c b/fs/hppfs/hppfs.c
index 126d3c2..8ef5779 100644
--- a/fs/hppfs/hppfs.c
+++ b/fs/hppfs/hppfs.c
@@ -436,7 +436,6 @@
 	path.mnt = inode->i_sb->s_fs_info;
 	path.dentry = HPPFS_I(inode)->proc_dentry;
 
-	/* XXX This isn't closed anywhere */
 	data->proc_file = dentry_open(&path, file_mode(file->f_mode), cred);
 	err = PTR_ERR(data->proc_file);
 	if (IS_ERR(data->proc_file))
@@ -523,12 +522,23 @@
 	return default_llseek(file, off, where);
 }
 
+static int hppfs_release(struct inode *inode, struct file *file)
+{
+	struct hppfs_private *data = file->private_data;
+	struct file *proc_file = data->proc_file;
+	if (proc_file)
+		fput(proc_file);
+	kfree(data);
+	return 0;
+}
+
 static const struct file_operations hppfs_file_fops = {
 	.owner		= NULL,
 	.llseek		= hppfs_llseek,
 	.read		= hppfs_read,
 	.write		= hppfs_write,
 	.open		= hppfs_open,
+	.release	= hppfs_release,
 };
 
 struct hppfs_dirent {
@@ -582,6 +592,7 @@
 	.open		= hppfs_dir_open,
 	.fsync		= hppfs_fsync,
 	.llseek		= default_llseek,
+	.release	= hppfs_release,
 };
 
 static int hppfs_statfs(struct dentry *dentry, struct kstatfs *sf)