Bugfix: Missing 'else' can result in null pointer dereference in race

miner.c

@@ -8028,6 +8028,7 @@ retry:
 			struct work *last_work = pool->last_work_copy;
 			if (!last_work)
 				{}
+			else
 			if (can_roll(last_work) && should_roll(last_work)) {
 				free_work(work);
 				work = make_clone(pool->last_work_copy);