builtin/notes: remove unnecessary free

511726e4b1 ("builtin/notes: fix premature failure when trying to add
the empty blob", 2014-11-09) removed the check for !len but left a
call to free the buffer that will be otherwise NULL

Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
Acked-by: Johan Herland <johan@herland.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/notes.c

@@ -255,10 +255,8 @@ static int parse_reuse_arg(const struct option *opt, const char *arg, int unset)
 
 	if (get_oid(arg, &object))
 		die(_("failed to resolve '%s' as a valid ref."), arg);
-	if (!(buf = read_object_file(&object, &type, &len))) {
-		free(buf);
+	if (!(buf = read_object_file(&object, &type, &len)))
 		die(_("failed to read object '%s'."), arg);
-	}
 	if (type != OBJ_BLOB) {
 		free(buf);
 		die(_("cannot read note data from non-blob object '%s'."), arg);