fix re_thread_init and add libre_cleanup()

include/re_main.h

@@ -42,6 +42,7 @@ struct re_fhs *fd_close(struct re_fhs *fhs);
 int   fd_setsize(int maxfds);
 
 int   libre_init(void);
+void  libre_cleanup(void);
 void  libre_close(void);
 void  libre_exception_btrace(bool enable);
 

src/main/init.c

@@ -168,25 +168,37 @@ int libre_init(void)
 		return err;
 	}
 
+	err = re_thread_init();
+	if (err)
+		return err;
+
 #ifdef RE_TRACE_ENABLED
-	re_trace_init("re_trace.json");
+	err = re_trace_init("re_trace.json");
+	if (err)
+		return err;
 #endif
 
-	err = re_thread_init();
-
-	return err;
+	return 0;
 }
 
 
 /**
- * Close library and free up all resources
+ * Cleanup libre resources (call before libre_close() and tmr_debug())
  */
-void libre_close(void)
+void libre_cleanup(void)
 {
-
+	re_thread_async_close();
 #ifdef RE_TRACE_ENABLED
 	re_trace_close();
 #endif
+}
+
+
+/**
+ * Close library and free up all resources
+ */
+void libre_close(void)
+{
 	(void)fd_setsize(0);
 	net_sock_close();
 	re_thread_close();

test/main.c

@@ -259,7 +259,8 @@ int main(int argc, char *argv[])
 	}
 
  out:
-	re_thread_async_close();
+
+	libre_cleanup();
 
 	/* Check for open timers */
 	tmr_debug();