Re #1818: Avoid warning caused by trying to destroy a locked jb mutex in pjmedia stream

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@5043 74dad513-b988-da41-8d7b-12977e46ad98

pjmedia/src/pjmedia/stream.c

@@ -2515,6 +2515,7 @@ PJ_DEF(pj_status_t) pjmedia_stream_destroy( pjmedia_stream *stream )
     /* Free mutex */
 
     if (stream->jb_mutex) {
+        pj_mutex_unlock(stream->jb_mutex);
 	pj_mutex_destroy(stream->jb_mutex);
 	stream->jb_mutex = NULL;
     }