Clang-format aos

It has drifted...  Clean it up a bit.

Change-Id: I2fe31a2187b4f690634ae6942786575db20192af
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/aos/containers/priority_queue.h b/aos/containers/priority_queue.h
index 8fb5e5c..b092219 100644
--- a/aos/containers/priority_queue.h
+++ b/aos/containers/priority_queue.h
@@ -96,6 +96,7 @@
   size_t next_idx(size_t idx) const { return list_[idx].upper_idx; }
   // Gets the index of the previous (lower valued) element in the queue.
   size_t prev_idx(size_t idx) const { return list_[idx].lower_idx; }
+
  private:
   struct Datum {
     // A list element with data and the indices of the next highest/lowest