ethtool: Expand documentation of struct ethtool_perm_addr

	__u64	data[0];

};

/**

 * struct ethtool_perm_addr - permanent hardware address

 * @cmd: Command number = %ETHTOOL_GPERMADDR

 * @size: On entry, the size of the buffer.  On return, the size of the

 *	address.  The command fails if the buffer is too small.

 * @data: Buffer for the address

 *

 * Users must allocate the buffer immediately following this structure.

 * A buffer size of %MAX_ADDR_LEN should be sufficient for any address

 * type.

 */

struct ethtool_perm_addr {

	__u32	cmd;		/* ETHTOOL_GPERMADDR */

	__u32	cmd;

	__u32	size;

	__u8	data[0];

};