floppy: address add_disk() error handling on probe

We need to cleanup resources on the probe() callback registered
with __register_blkdev(), now that add_disk() error handling is
supported. Address this.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Link: https://lore.kernel.org/r/20211103230437.1639990-14-mcgrof@kernel.orgSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/floppy.c

@@ -4528,10 +4528,19 @@ static void floppy_probe(dev_t dev)
 		return;
 
 	mutex_lock(&floppy_probe_lock);
-	if (!disks[drive][type]) {
-		if (floppy_alloc_disk(drive, type) == 0)
-			add_disk(disks[drive][type]);
-	}
+	if (disks[drive][type])
+		goto out;
+	if (floppy_alloc_disk(drive, type))
+		goto out;
+	if (add_disk(disks[drive][type]))
+		goto cleanup_disk;
+out:
+	mutex_unlock(&floppy_probe_lock);
+	return;
+
+cleanup_disk:
+	blk_cleanup_disk(disks[drive][type]);
+	disks[drive][type] = NULL;
 	mutex_unlock(&floppy_probe_lock);
 }