logd: correctly label identical lines

Move lastTid array from local in LogBuffer::flushTo to per-reader
context in LogTimes::mLastTid and pass into LogBuffer::flushTo.

Replace NULL with nullptr in touched files.

Simplify LogTimeEntry::cleanSkip_Locked initialization of skipAhead
to memset, to match mLastTid memset initialization.

Test: gTest liblog-unit-tests, logd-unit-tests & logcat-unit-tests
Test: adb logcat -b all | grep chatty | grep -v identical
Bug: 36488201
Change-Id: I0c3887f220a57f80c0490be4b182657b9563aa3f
5 files changed
tree: d35553ac27205c2dd274aaeb04b47bc9ddf64f39
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/