logd: prune maintain per-id watermark (part deux)

iterator corruption as we allow mLast to slip through the FIFO

Bug: 23685592
Bug: 26646087
Change-Id: Ifcbaecf390ee47b195c3d823d080c66c15db4530
1 file changed
tree: 9a2e83b50c304f6e402627947227017133feb053
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/