added missing branch in tag-detection

libfreefare/freefare.c

@@ -181,6 +181,9 @@ freefare_tag_new_pcsc (struct pcsc_context *context, const char *reader)
  if (0 == memcmp (pbAttr_copy, current_tag, 20)){
  tagtype = ULTRALIGHT;
  printf("ULTRALIGHT\n");
+ } else {
+ printf("unknown tag\n");
+ return NULL;
  } 
  }
  else