Fix VPI timed callbacks to be one-shot, pull5.

Signed-off-by: Matthew Ballance <[email protected]>
Signed-off-by: Wilson Snyder <[email protected]>

include/verilated_vpi.cpp

@@ -416,7 +416,9 @@ public:
         for (VpioTimedCbs::iterator it=s_s.m_timedCbs.begin(); it!=s_s.m_timedCbs.end(); ) {
             if (VL_UNLIKELY(it->first <= time)) {
                 VerilatedVpioCb* vop = it->second;
-                ++it;  // iterator may be deleted by callback
+                VpioTimedCbs::iterator last_it = it;
+                ++it;  // Timed callbacks are one-shot
+                s_s.m_timedCbs.erase(last_it);
                 VL_DEBUG_IF_PLI(VL_DBG_MSGF("- vpi: timed_callback %p\n", vop););
                 (vop->cb_rtnp()) (vop->cb_datap());
             }