Walk through InterfacesAdded data correctly.

internal/platform/implementation/linux/bluetooth_classic_medium.cc

@@ -1,6 +1,6 @@
 #include <cstring>
-
 #include <memory>
+
 #include <systemd/sd-bus.h>
 
 #include "absl/strings/str_replace.h"
@@ -86,6 +86,11 @@ int bluez_interfaces_added_signal_handler(sd_bus_message *m, void *userdata,
       }
       return 0;
     }
+    ret = sd_bus_message_skip(m, "a{sv}");
+    if (ret < 0) {
+      NEARBY_LOGS(ERROR) << __func__ << "Error skipping dict entry: " << ret;
+      return -1;
+    }
   }
 
   return 0;