block: add a macro to initialize the status table

block: add a macro to initialize the status table

Prepare for adding a new value to the error table by adding a macro
to fill it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@kernel.org>
Reviewed-by: Md Haris Iqbal <haris.iqbal@linux.dev>
Link: https://patch.msgid.link/20260611140703.2401204-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>