swim: fix a missing FMODE_ -> BLK_OPEN_ conversion in floppy_open

Fix a missing conversion to the new BLK_OPEN constant in swim.

Fixes: 05bdb99 ("block: replace fmode_t with a block-specific type for block open flags")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20230620043051.707196-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: Christoph Hellwig

drivers/block/swim.c

@@ -640,7 +640,7 @@ static int floppy_open(struct gendisk *disk, blk_mode_t mode)
 	if (mode & (BLK_OPEN_READ | BLK_OPEN_WRITE)) {
 		if (disk_check_media_change(disk) && fs->disk_in)
 			fs->ejected = 0;
-		if ((mode & FMODE_WRITE) && fs->write_protected) {
+		if ((mode & BLK_OPEN_WRITE) && fs->write_protected) {
 			err = -EROFS;
 			goto out;
 		}