GH-131296: Add missing UNREACHABLE mark in thread_nt.h (GH-131589)

diff --git a/Python/thread_nt.h b/Python/thread_nt.h
index 3a01a7fe327c8f63bcd27015f9edaa6c75767183..e078b98be3cdf43fad71d5b641cc19b2a823be1f 100644 (file)
--- a/Python/thread_nt.h
+++ b/Python/thread_nt.h
@@ -289,6 +289,7 @@ PyThread_exit_thread(void)
     if (!initialized)
         exit(0);
     _endthreadex(0);
+    Py_UNREACHABLE();
 }
 
 void _Py_NO_RETURN