Discovered by coverty:
CID 1473630: Code maintainability issues (UNUSED_VALUE)
Assigning value from "type_to_guid_and_name(type, &name)" to
"part_guid" here, but that stored value is overwritten before it can
be used.
Remove the now redundant assignment of part_guid which is also set
conditionally later on.
Fixes: 4a078bd135 ("firmware-utils/ptgen: fix partition guid and name")
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
00a326a736