Report friendly name of troublesome IGDs.

src/upnp.h

@@ -103,14 +103,16 @@ private:
                 auto query_begin = steady_clock::now();
                 auto curr_duration = get_mapping_duration(igd, mapping_desc, cancel, yield);
                 if (curr_duration && *curr_duration > lease_duration) {
-                    LOG_WARN("UPnP: IGD reports excessive mapping lease duration, ignoring");
+                    LOG_WARN("UPnP: IGD \"", igd.friendly_name(), "\""
+                             " reports excessive mapping lease duration, ignoring");
                     continue;
                 }
                 if (!curr_duration || lease_duration >= *curr_duration + recent_margin) {
                     // Versions of MiniUPnPd before 2015-07-09 fail to refresh existing mappings,
                     // see <https://github.com/miniupnp/miniupnp/issues/131>,
                     // so check actual result and do not count if failed.
-                    LOG_VERBOSE("UPnP: IGD did not add/refresh mapping for \"", mapping_desc, "\""
+                    LOG_VERBOSE("UPnP: IGD \"", igd.friendly_name(), "\""
+                                " did not add/refresh mapping for \"", mapping_desc, "\""
                                 " but reported no error; buggy IGD/router?");
                     auto mapping_timeout = query_begin + (curr_duration ? *curr_duration : seconds(0));
                     if (!earlier_buggy_timeout || mapping_timeout < *earlier_buggy_timeout)