Merge branch 'sb/misc-fixes'

Assorted code cleanups and a minor fix.

* sb/misc-fixes:
  diff.c: Do not initialize a variable, which gets reassigned anyway.
  commit: Fix a memory leak in determine_author_info
  daemon.c:handle: Remove unneeded check for null pointer.

diff --cc builtin/commit.c
Simple merge

diff --cc daemon.c
Simple merge

diff --cc diff.c
Simple merge