qemu/hw/scsi/scsi-disk.c:2741: possible missing break ?

qemu/hw/scsi/scsi-disk.c:2741] -> [qemu/hw/scsi/scsi-disk.c:2745]: (warning) Variable 'cdb1' is reassigned a value before the old one has been used. 'break;' missing?
qemu/hw/scsi/scsi-disk.c:2742] -> [qemu/hw/scsi/scsi-disk.c:2746]: (warning) Variable 'group_number' is reassigned a value before the old one has been used. 'break;' missing?

Source code is

    case 1:
        /* 10-byte CDB.  */
        r->cdb1 = req->cmd.buf[1];
        r->group_number = req->cmd.buf[6];
    case 4:
        /* 12-byte CDB.  */

Also,

[qemu/hw/scsi/scsi-disk.c:2063]: (warning) %lu in format string (no. 1) requires 'unsigned long' but the argument type is 'signed long'.
[qemu/hw/scsi/scsi-disk.c:2066]: (warning) %lu in format string (no. 1) requires 'unsigned long' but the argument type is 'signed long'.
[qemu/hw/scsi/scsi-disk.c:2069]: (warning) %lu in format string (no. 1) requires 'unsigned long' but the argument type is 'signed long'.
[qemu/hw/scsi/scsi-disk.c:2083]: (warning) %lu in format string (no. 2) requires 'unsigned long' but the argument type is 'signed long'.