ice_transport.cpp: cleanup

Change-Id: I8a9c0e958b39296968837de502e81a0a0d3f623d

src/ice_transport.cpp

@@ -996,7 +996,7 @@ IceTransport::Impl::requestUpnpMappings()
     // Check the number of mappings
     if (state->failed || state->mappings.size() != compCount_) {
         if (logger_)
-            logger_->error("[ice:{}] UPnP mapping failed: expected {:d} mappings, got {:d}",
+            logger_->error("[ice:{}] UPnP mapping failed: expected {:d} mapping(s), got {:d}",
                 fmt::ptr(this),
                 compCount_,
                 state->mappings.size());