Use wq_for in mktree, instead of wq_for_serial

dd3aba4e · Silas Boyd-Wickizer · 8aa79839 · dd3aba4e
--- a/bin/mktree.cc
+++ b/bin/mktree.cc
@@ -12,7 +12,7 @@ dolevel(int fd, int depth)
 {
  if (depth > 0) {
    int it = 0;                                
-    wq_for_serial<int>(it,
+    wq_for<int>(it,
                [](int &it)->bool { return it < branch; },
                [&fd, &depth](int i)->void
    {