bcachefs: Clear k->needs_whitout earlier in commit path

The upcoming btree write buffer rework is going to use the journal
itself as the first stage of the write buffer; this is a cleanup to make
sure k->needs_whiteout is initialized before keys hit the journal.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/btree_trans_commit.c

@@ -655,6 +655,8 @@ bch2_trans_commit_write_locked(struct btree_trans *trans, unsigned flags,
 			*stopped_at = i;
 			return ret;
 		}
+
+		i->k->k.needs_whiteout = false;
 	}
 
 	if (trans->nr_wb_updates &&
@@ -777,8 +779,6 @@ bch2_trans_commit_write_locked(struct btree_trans *trans, unsigned flags,
 	}
 
 	trans_for_each_update(trans, i) {
-		i->k->k.needs_whiteout = false;
-
 		if (!i->cached) {
 			u64 seq = trans->journal_res.seq;