ext4: drop set but otherwise unused variable from ext4_add_dirent_to_inline()

	struct inode	*dir = dentry->d_parent->d_inode;

	const char	*name = dentry->d_name.name;

	int		namelen = dentry->d_name.len;

	unsigned short	reclen;

	int		err;

	struct ext4_dir_entry_2 *de;

	reclen = EXT4_DIR_REC_LEN(namelen);

	err = ext4_find_dest_de(dir, inode, iloc->bh,

				inline_start, inline_size,

				name, namelen, &de);