sed-opal: Remove unnecessary ‘0’ values from error

error is assigned first, so it does not need to initialize the assignment.

Signed-off-by: Li zeming <zeming@nfschina.com>
Link: https://lore.kernel.org/r/20240306095608.26839-1-zeming@nfschina.com


Signed-off-by: Jens Axboe <axboe@kernel.dk>