another cleanup fix

src/main.c

@@ -240,13 +240,13 @@ int main(int argc, pchar *argv[]) {
 			uprintf(USTR("Called from %s\n"), hl_aptr(a,uchar*)[i]);
 		hl_debug_break();
 		hl_global_free();
-		hl_unregister_thread();
 		return 1;
 	}
 	hl_module_free(ctx.m);
 	hl_free(&ctx.code->alloc);
+	// do not call hl_unregister_thread() or hl_global_free will display error 
+	// on global_lock if there are threads that are still running (such as debugger)
 	hl_global_free();
-	hl_unregister_thread();
 	return 0;
 }