ioctl: Rearrange members in nvme_get_lba_status_args

ioctl: Rearrange members in nvme_get_lba_status_args

Avoid any holes in the struct by rearranging the members. Also add the
attribute packed to struct definition to reduce ABI breakage.

struct nvme_get_lba_status_args {
        int                        args_size;            /*     0     4 */
        int                        fd;                   /*     4     4 */
        __u32 *                    result;               /*     8     8 */
        __u32                      timeout;              /*    16     4 */
        __u32                      nsid;                 /*    20     4 */
        __u32                      mndw;                 /*    24     4 */
        enum nvme_lba_status_atype atype;                /*    28     4 */
        __u64                      slba;                 /*    32     8 */
        struct nvme_lba_status *   lbas;                 /*    40     8 */
        __u16                      rl;                   /*    48     2 */

        /* size: 50, cachelines: 1, members: 10 */
        /* last cacheline: 50 bytes */
} __attribute__((__packed__));

Signed-off-by: Daniel Wagner <dwagner@suse.de>