f2fs: clean up opened code with f2fs_update_dentry

void do_make_empty_dir(struct inode *inode, struct inode *parent,

					struct f2fs_dentry_ptr *d)

{

	struct f2fs_dir_entry *de;

	de = &d->dentry[0];

	de->name_len = cpu_to_le16(1);

	de->hash_code = 0;

	de->ino = cpu_to_le32(inode->i_ino);

	memcpy(d->filename[0], ".", 1);

	set_de_type(de, inode->i_mode);

	struct qstr dot = QSTR_INIT(".", 1);

	struct qstr dotdot = QSTR_INIT("..", 2);

	de = &d->dentry[1];

	de->hash_code = 0;

	de->name_len = cpu_to_le16(2);

	de->ino = cpu_to_le32(parent->i_ino);

	memcpy(d->filename[1], "..", 2);

	set_de_type(de, parent->i_mode);

	/* update dirent of "." */

	f2fs_update_dentry(inode->i_ino, inode->i_mode, d, &dot, 0, 0);

	test_and_set_bit_le(0, (void *)d->bitmap);

	test_and_set_bit_le(1, (void *)d->bitmap);

	/* update dirent of ".." */

	f2fs_update_dentry(parent->i_ino, parent->i_mode, d, &dotdot, 0, 1);

}

static int make_empty_dir(struct inode *inode,