liblog: add -Wall,-Wextra and do related clean-up.

Test: build
Change-Id: I3b33f2b896cb8bf7ad9edf110d1739d559028282
5 files changed
tree: ea6bf62e961aa924a2d5a3477d31aaa8a3f93b7f
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/