void diffcore_order(const char *orderfile)
{
struct diff_queue_struct *q = &diff_queued_diff;
- struct pair_order *o = xmalloc(sizeof(*o) * q->nr);
+ struct pair_order *o;
int i;
+ if (!q->nr)
+ return;
+
+ o = xmalloc(sizeof(*o) * q->nr);
prepare_order(orderfile);
for (i = 0; i < q->nr; i++) {
o[i].pair = q->queue[i];