fix(client): report read-timeout restore failures

crates/irtt-client/src/client.rs

@@ -85,7 +85,7 @@ impl Client {
             .set_read_timeout(self.config.socket_config.recv_timeout);
         match (outcome, restore) {
             (Ok(outcome), Ok(())) => Ok(outcome),
-            (Ok(outcome), Err(_)) => Ok(outcome),
+            (Ok(_), Err(source)) => Err(ClientError::ReadTimeoutRestore { source }),
             (Err(err), Ok(())) => Err(err),
             (Err(err), Err(_)) => Err(err),
         }

crates/irtt-client/src/error.rs

@@ -14,6 +14,8 @@ pub enum ClientError {
         remote: std::net::SocketAddr,
         source: io::Error,
     },
+    #[error("failed to restore configured socket read timeout after open negotiation: {source}")]
+    ReadTimeoutRestore { source: io::Error },
     #[error("protocol error: {0}")]
     Protocol(#[from] irtt_proto::ProtoError),
     #[error("all open requests timed out")]