drtio_routing: changed warning message

src/libboard_artiq/src/drtio_routing.rs

@@ -1,6 +1,6 @@
 use libconfig::Config;
 #[cfg(has_drtio_routing)]
-use pl::csr; // <- check if it works in the same way
+use pl::csr;
 use core::fmt;
 
 use log::{warn, info};
@@ -67,7 +67,7 @@ pub fn config_routing_table(default_n_links: usize, cfg: Config) -> RoutingTable
             }
         }
         else {
-            warn!("could not read routing table from configuration, using default");
+            warn!("length of the routing table is incorrect, using default");
         }
     }
     else {