StrictMode: fix deserialization of ViolationInfo on large stacks

When a large stack trace is encountered, one too many ViolationInfo
objects would be drained, which may cause a system_server crash
when readStringArray() is called on incorrect data.

Change-Id: Icb30d0402638ea5b6d63004b598d2f0bb276d685
(cherry picked from commit 1e60f9b9)