ice_transport: don't fail on UDP for epending status

PJ_EPENDING can be ignored for UDP. In fact, because it's a UDP
packet we don't care.

Change-Id: I84636730853bae2d43f39b16e638c6b7f57e276b
Gitlab: #165

src/ice_transport.cpp

@@ -1244,7 +1244,7 @@ IceTransport::send(int comp_id, const unsigned char* buf, size_t len)
           pimpl_->waitDataCv_.wait(lk);
           current_size = pimpl_->lastReadLen_[comp_id];
         }
-    } else if (status != PJ_SUCCESS) {
+    } else if (status != PJ_SUCCESS && status != PJ_EPENDING) {
         if (status == PJ_EBUSY) {
             errno = EAGAIN;
         } else {