* cygthread.cc (new): Add a little more debugging.

* thread.cc (pthread_null::exit): Add a _my_tls.remove() for safety.

winsup/cygwin/thread.cc

@@ -3288,6 +3288,7 @@ pthread_null::create (void *(*)(void *), pthread_attr *, void *)
 void
 pthread_null::exit (void *value_ptr)
 {
+  _my_tls.remove (INFINITE);
   ExitThread (0);
 }