Merge branch 'jk/maint-tformat-with-z'

"log -z --pretty=tformat:..." does not terminate each record with NUL
and this is a beginning of an attempt to fix it.  It still is not right
but the patch does not make externally observable behaviour worse.

By Jan Krüger (1) and Junio C Hamano (1)
* jk/maint-tformat-with-z:
  log-tree: the previous one is still not quite right
  log-tree: use custom line terminator in line termination mode

log-tree.c

@@ -682,7 +682,7 @@ void show_log(struct rev_info *opt)
 	if (opt->use_terminator) {
 		if (!opt->missing_newline)
 			graph_show_padding(opt->graph);
-		putchar('\n');
+		putchar(opt->diffopt.line_termination);
 	}
 
 	strbuf_release(&msgbuf);