bcachefs: Fix double free of ca->buckets_nouse

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Fixes: ffcbec60 ("bcachefs: Kill opts.buckets_nouse")
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/super.c

@@ -1193,7 +1193,6 @@ static void bch2_dev_free(struct bch_dev *ca)
 	if (ca->kobj.state_in_sysfs)
 		kobject_del(&ca->kobj);
 
-	kfree(ca->buckets_nouse);
 	bch2_free_super(&ca->disk_sb);
 	bch2_dev_allocator_background_exit(ca);
 	bch2_dev_journal_exit(ca);