editor.c: use error_errno()

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

editor.c

@@ -63,7 +63,6 @@ int launch_editor(const char *path, struct strbuf *buffer, const char *const *en
 	if (!buffer)
 		return 0;
 	if (strbuf_read_file(buffer, path, 0) < 0)
-		return error("could not read file '%s': %s",
-				path, strerror(errno));
+		return error_errno("could not read file '%s'", path);
 	return 0;
 }