Do not error on the listen port not set, for override-endpoint --unset (#317)

* Do not error on the listen port not set, for override-endpoint --unset

* Fix build

client/src/main.rs

@@ -1002,14 +1002,14 @@ fn override_endpoint(
     sub_opts: OverrideEndpointOpts,
 ) -> Result<(), Error> {
     let config = InterfaceConfig::from_interface(&opts.config_dir, interface)?;
-    let port = match config.interface.listen_port {
-        Some(port) => port,
-        None => bail!("you need to set a listen port with set-listen-port before overriding the endpoint (otherwise port randomization on the interface would make it useless).")
-    };
 
     let endpoint_contents = if sub_opts.unset {
         prompts::unset_override_endpoint(&sub_opts)?.then_some(EndpointContents::Unset)
     } else {
+        let port = match config.interface.listen_port {
+            Some(port) => port,
+            None => bail!("you need to set a listen port with set-listen-port before overriding the endpoint (otherwise port randomization on the interface would make it useless).")
+        };
         let endpoint = prompts::override_endpoint(&sub_opts, port)?;
         endpoint.map(EndpointContents::Set)
     };

hostsfile/src/lib.rs

@@ -12,6 +12,7 @@ use std::{
 pub type Result<T> = result::Result<T, Box<dyn std::error::Error>>;
 
 /// A custom error struct for this crate.
+#[allow(dead_code)]
 #[derive(Debug, Clone)]
 pub struct Error(String);