nbd: nbd_bg_flags_show: add NBD_FLAG_ROTATIONAL

Also handle NBD_FLAG_ROTATIONAL in our debug helper function
Signed-off-by: Wouter Verhelst <w@uter.be>
Cc: Eric Blake <eblake@redhat.Com>
Link: https://lore.kernel.org/r/20240812133032.115134-6-w@uter.beSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/nbd.c

@@ -1725,6 +1725,8 @@ static int nbd_dbg_flags_show(struct seq_file *s, void *unused)
 		seq_puts(s, "NBD_FLAG_SEND_TRIM\n");
 	if (flags & NBD_FLAG_SEND_WRITE_ZEROES)
 		seq_puts(s, "NBD_FLAG_SEND_WRITE_ZEROES\n");
+	if (flags & NBD_FLAG_ROTATIONAL)
+		seq_puts(s, "NBD_FLAG_ROTATIONAL\n");
 
 	return 0;
 }