ice_transport: Replace assertion for conditional

Change-Id: Ieb12a81646de61bce2cbb1e369e1c8a82ea118da

src/ice_transport.cpp

@@ -322,14 +322,15 @@ IceTransport::Impl::~Impl()
         thread_.join();
     }
 
+    if (icest_) {
+
         pj_ice_strans* strans = nullptr;
 
         std::swap(strans, icest_);
 
-    assert(strans);
-
         // must be done before ioqueue/timer destruction
-    JAMI_INFO("[ice:%p] Destroying ice_strans %p", pj_ice_strans_get_user_data(strans), strans);
+        JAMI_INFO("[ice:%p] Destroying ice_strans %p",
+                  pj_ice_strans_get_user_data(strans), strans);
 
         pj_ice_strans_stop_ice(strans);
         pj_ice_strans_destroy(strans);
@@ -345,7 +346,9 @@ IceTransport::Impl::~Impl()
         if (ret < 0) {
             JAMI_ERR("[ice:%p] IO queue polling failed", this);
         } else if (ret > 0) {
-        JAMI_ERR("[ice:%p] Unexpected left timer in timer heap. Please report the bug", this);
+            JAMI_ERR("[ice:%p] Unexpected left timer in timer heap. "
+                     "Please report the bug",
+                     this);
         }
 
         if (checkEventQueue(1) > 0) {
@@ -357,6 +360,7 @@ IceTransport::Impl::~Impl()
 
         if (config_.stun_cfg.timer_heap)
             pj_timer_heap_destroy(config_.stun_cfg.timer_heap);
+    }
 
     JAMI_DBG("[ice:%p] done destroying", this);
 }