am a9a4cd48: gltrace: Make sure device is debuggable.

* commit 'a9a4cd4806ea5b2cf525c8ab4c6604d78c6e3f8f':
  gltrace: Make sure device is debuggable.
diff --git a/include/utils/Vector.h b/include/utils/Vector.h
index 7927328..f3020d6 100644
--- a/include/utils/Vector.h
+++ b/include/utils/Vector.h
@@ -188,7 +188,8 @@
      inline void push_back(const TYPE& item)  { insertAt(item, size(), 1); }
      inline void push_front(const TYPE& item) { insertAt(item, 0, 1); }
      inline iterator erase(iterator pos) {
-         return begin() + removeItemsAt(pos-array());
+         ssize_t index = removeItemsAt(pos-array());
+         return begin() + index;
      }
 
 protected: