Merge branch 'master' into next

Merge branch 'master' into next

* master:
  t9300: use perl "head -c" clone in place of "dd bs=1 count=16000" kluge
  builtin/rm.c: Use ALLOC_GROW instead of alloc_nr and xrealloc.
  builtin/branch.c: Use ALLOC_GROW instead of alloc_nr and xrealloc.
  gitweb: Include links to feeds in HTML header only for '200 OK' response
  fsck docs: remove outdated and useless diagnostic
  userdiff: fix typo in ruby and python word regexes
  trace.c: mark file-local function static
  Fix typo in git-gc document.