change refcount, avoid ShmMsgQueue AddRef on send.

lichao

2021-05-14 c0d61292ef6bdd8e2e93525b5df6a8ec5c017c32

 src/bh_api.h

@@ -115,7 +115,7 @@
                const void *reply,
                const int reply_len);

// int BHCleanUp();
int BHCleanup();

void BHFree(void *buf, int size);