bcachefs: Ensure __bch2_trans_commit() always calls bch2_trans_reset()

This was leading to a very strange bug in bch2_bucket_io_time_reset(),
where we'd retry without clearing out the list of updates.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/btree_update_leaf.c

@@ -836,7 +836,7 @@ int __bch2_trans_commit(struct btree_trans *trans)
 	int ret = 0;
 
 	if (!trans->nr_updates)
-		goto out_noupdates;
+		goto out_reset;
 
 	if (trans->flags & BTREE_INSERT_GC_LOCK_HELD)
 		lockdep_assert_held(&trans->c->gc_lock);
@@ -850,7 +850,7 @@ int __bch2_trans_commit(struct btree_trans *trans)
 	    unlikely(!percpu_ref_tryget(&trans->c->writes))) {
 		ret = bch2_trans_commit_get_rw_cold(trans);
 		if (ret)
-			return ret;
+			goto out_reset;
 	}
 
 #ifdef CONFIG_BCACHEFS_DEBUG
@@ -962,7 +962,7 @@ int __bch2_trans_commit(struct btree_trans *trans)
 
 	if (likely(!(trans->flags & BTREE_INSERT_NOCHECK_RW)))
 		percpu_ref_put(&trans->c->writes);
-out_noupdates:
+out_reset:
 	bch2_trans_reset(trans, !ret ? TRANS_RESET_NOTRAVERSE : 0);
 
 	return ret;