proto: avoid unwrapping varint decoding during transport parameter parsing

Author: djc

quinn-proto/src/transport_parameters.rs

@@ -470,14 +470,14 @@ impl TransportParameters {
                     if len > 8 || params.max_datagram_frame_size.is_some() {
                         return Err(Error::Malformed);
                     }
-                    params.max_datagram_frame_size = Some(r.get().unwrap());
+                    params.max_datagram_frame_size = Some(r.get()?);
                 }
                 TransportParameterId::GreaseQuicBit => match len {
                     0 => params.grease_quic_bit = true,
                     _ => return Err(Error::Malformed),
                 },
                 TransportParameterId::MinAckDelayDraft07 => {
-                    params.min_ack_delay = Some(r.get().unwrap())
+                    params.min_ack_delay = Some(r.get()?)
                 }
                 _ => {
                     macro_rules! parse {