buffer: do not leak memory if buffer is too big
A recent pull request changed this method to throw when the buffer was
too big, but this meant that the free finalizer would never get
called, leading to a memory leak.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
A recent pull request changed this method to throw when the buffer was
too big, but this meant that the free finalizer would never get
called, leading to a memory leak.