Merge branch 'maint-1.6.4' into maint-1.6.5

* maint-1.6.4:
  Fix mis-backport of t7002
  base85: Make the code more obvious instead of explaining the non-obvious
  base85: encode_85() does not use the decode table
  base85 debug code: Fix length byte calculation
  checkout -m: do not try to fall back to --merge from an unborn branch
  branch: die explicitly why when calling "git branch [-a|-r] branchname".
  textconv: stop leaking file descriptors
  commit: --cleanup is a message option
  git count-objects: handle packs bigger than 4G
  t7102: make the test fail if one of its check fails

diff.c

@@ -3720,11 +3720,13 @@ static char *run_textconv(const char *pgm, struct diff_filespec *spec,
 	if (start_command(&child) != 0 ||
 	    strbuf_read(&buf, child.out, 0) < 0 ||
 	    finish_command(&child) != 0) {
+		close(child.out);
 		strbuf_release(&buf);
 		remove_tempfile();
 		error("error running textconv command '%s'", pgm);
 		return NULL;
 	}
+	close(child.out);
 	remove_tempfile();
 
 	return strbuf_detach(&buf, outsize);