floppy: fix use-after-free in module load failure path

Commit 4882118 ("floppy: switch to one queue per drive instead of
sharing a queue") introduced a use-after-free.  We do "put_disk()" on
the disk device _before_ we then clean up the queue associated with that
disk.

Move the put_disk() down to avoid dereferencing a free'd data structure.

Cc: Jens Axboe <[email protected]>
Cc: Vivek Goyal <[email protected]>
Reported-and-tested-by: Randy Dunlap <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

drivers/block/floppy.c

@@ -4363,9 +4363,9 @@ static int __init floppy_init(void)
 out_put_disk:
 	while (dr--) {
 		del_timer(&motor_off_timer[dr]);
-		put_disk(disks[dr]);
 		if (disks[dr]->queue)
 			blk_cleanup_queue(disks[dr]->queue);
+		put_disk(disks[dr]);
 	}
 	return err;
 }