inotify: fix warnings

inotify04.c:200:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if (len == -1)
          ^
inotify04.c:206:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while (i < len) {

inotify02.c:202:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         && event_set[TST_TOTAL - 1].mask ==
                                          ^
inotify02.c:223:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    } else if ((event_set[test_num].mask == event->mask)
inotify: print event->name accoding with event->len