session CHANGE print caller in mutex lock fail
diff --git a/src/session_server.c b/src/session_server.c
index bdd4430..ca89244 100755
--- a/src/session_server.c
+++ b/src/session_server.c
@@ -1125,7 +1125,7 @@
     }
 
     /* reading an RPC and sending a reply must be atomic (no other RPC should be read) */
-    ret = nc_timedlock(cur_session->ti_lock, timeout);
+    ret = nc_timedlock(cur_session->ti_lock, timeout, __func__);
     if (ret < 0) {
         ret = NC_PSPOLL_ERROR;
         goto finish;