Merge branch 'ma/grep-init-default'

Code clean-up.

* ma/grep-init-default:
  MyFirstObjectWalk: drop `init_walken_defaults()`
  grep: copy struct in one fell swoop
  grep: use designated initializers for `grep_defaults`
  grep: don't set up a "default" repo for grep

builtin/log.c

@@ -133,7 +133,6 @@ static int log_line_range_callback(const struct option *option, const char *arg,
 
 static void init_log_defaults(void)
 {
-	init_grep_defaults(the_repository);
 	init_diff_ui_defaults();
 
 	decoration_style = auto_decoration_style();