Merge branch 'master' of git://git.kernel.org/pub/scm/git/git

Merge branch 'master' of git://git./git/git

* 'master' of git://git.kernel.org/pub/scm/git/git: (43 commits)
  completion: fix zsh check under bash with 'set -u'
  Fix copy-pasted comments related to tree diff handling.
  send-email: Don't leak To: headers between patches
  send-email: extract_valid_address use qr// regexes
  send-email: is_rfc2047_quoted use qr// regexes
  send-email: use Perl idioms in while loop
  send-email: make_message_id use "require" instead of "use"
  send-email: send_message die on $!, not $?
  send-email: use (?:) instead of () if no match variables are needed
  send-email: sanitize_address use qq["foo"], not "\"foo\""
  send-email: sanitize_address use $foo, not "$foo"
  send-email: use \E***\Q instead of \*\*\*
  send-email: cleanup_compose_files doesn't need a prototype
  send-email: unique_email_list doesn't need a prototype
  send-email: file_declares_8bit_cte doesn't need a prototype
  send-email: get_patch_subject doesn't need a prototype
  send-email: use lexical filehandles during sending
  send-email: use lexical filehandles for $compose
  send-email: use lexical filehandle for opendir
  send-email: Use To: headers in patch files
  ...