scsi: scsi_debug: Fix one-partition tape setup bounds

The tape setup path uses one tape_block entry as the end-of-data marker
after the usable tape blocks. For the one-partition layout, partition 0
uses all TAPE_UNITS data slots and partition 1's marker is written at
tape_blocks[0] + TAPE_UNITS.

Only TAPE_UNITS entries are allocated, so that marker write is one
element past the allocation during device initialization before any
command is issued.

Allocate one extra tape_block entry for the marker. This keeps the
existing partitioning paths unchanged while providing backing storage
for the sentinel.

Assisted-by: Codex:gpt-5.5-cyber-preview
Signed-off-by: Samuel Moelius <sam.moelius@trailofbits.com>
Reviewed-by: Kai Mäkisara <Kai.Makisara@kolumbus.fi>
Link: https://patch.msgid.link/20260604234724.1936118-1-sam.moelius@trailofbits.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

0 files changed, 0 insertions, 0 deletions