Eliminate warnings

pageserver/src/layered_repository.rs

@@ -1163,7 +1163,6 @@ impl LayeredTimeline {
     ///
     fn get_layer_for_write(&self, seg: SegmentTag, lsn: Lsn) -> Result<Arc<InMemoryLayer>> {
         let mut layers = self.layers.lock().unwrap();
-        let mut delayed = false;
 
         assert!(lsn.is_aligned());
 

pageserver/src/walreceiver.rs

@@ -23,8 +23,6 @@ use postgres_types::PgLsn;
 use std::cmp::{max, min};
 use std::collections::HashMap;
 use std::fs;
-use std::fs::{File, OpenOptions};
-use std::io::{Seek, SeekFrom, Write};
 use std::str::FromStr;
 use std::sync::Mutex;
 use std::thread;