fixup dev refs

src/avclan/peripheral.hpp

@@ -143,7 +143,7 @@ private:
       dev.resolvepending();
   }
   template <Device Dev>
-  void device_preroute(Dev dev, const Frame *in, Frame *out) {
+  void device_preroute(Dev &dev, const Frame *in, Frame *out) {
     out->owning_device = Dev::id;
     dev.handle(in, out);
   }

src/sniffer.cc

@@ -99,7 +99,7 @@ int main() {
       }
     }
 
-    peripheral.poll_devices([&](auto dev) {
+    peripheral.poll_devices([&](auto &dev) {
       if (auto status = cache.pop()) {
         dev.emit(status.get());
         outgoing.push(std::move(status));