block: Clear BIO_EMULATES_ZONE_APPEND flag on BIO completion

When blk_zone_write_plug_bio_endio() is called for a regular write BIO
used to emulate a zone append operation, that is, a BIO flagged with
BIO_EMULATES_ZONE_APPEND, the BIO operation code is restored to the
original REQ_OP_ZONE_APPEND but the BIO_EMULATES_ZONE_APPEND flag is not
cleared. Clear it to fully return the BIO to its orginal definition.

Fixes: 9b1ce7f ("block: Implement zone append emulation")
Cc: stable@vger.kernel.org
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20250611005915.89843-1-dlemoal@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: damien-lemoal

block/blk-zoned.c

@@ -1225,6 +1225,7 @@ void blk_zone_write_plug_bio_endio(struct bio *bio)
 	if (bio_flagged(bio, BIO_EMULATES_ZONE_APPEND)) {
 		bio->bi_opf &= ~REQ_OP_MASK;
 		bio->bi_opf |= REQ_OP_ZONE_APPEND;
+		bio_clear_flag(bio, BIO_EMULATES_ZONE_APPEND);
 	}
 
 	/*