The 3w-9xxx and 3w-sas drivers parse a fixed firmware-owned field
containing a description and an optional second string.  Both drivers must
terminate the field before finding that optional string and must not form a
pointer one byte past the field when the first string consumes its last
byte.

Changes in v2:
- Group the two same-root SCSI fixes into one ordered series.
- Factor the repeated bounded optional-string handling into one helper per
  driver.
- Preserve the prior standalone submission lineage below.
Link: https://lore.kernel.org/r/20260704010512.71912-1-pengpeng@iscas.ac.cn
Link: https://lore.kernel.org/r/20260704010619.81878-1-pengpeng@iscas.ac.cn