CFMutableDictionaryRef update = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
CFDictionarySetValue(update, kSecAttrLabel, label);
ok_status(SecItemUpdate(query, update), "%s: SecItemUpdate", name);
CFMutableDictionaryRef update = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
CFDictionarySetValue(update, kSecAttrLabel, label);
ok_status(SecItemUpdate(query, update), "%s: SecItemUpdate", name);