Remove deprecated usage of description()

Author: darkwisebear

src/hashfilecache.rs

@@ -3,7 +3,6 @@ use std::sync::{Arc, Mutex};
 use std::path::{Path, PathBuf};
 use std::io::{self, Read, Write, Seek, SeekFrom, BufReader};
 use std::fmt::{self, Formatter, Debug};
-use std::error::Error;
 use std::iter::FromIterator;
 
 use rand::{prelude::*, distributions::Alphanumeric};
@@ -129,7 +128,7 @@ impl FileCachePath {
 
         debug!("Removing staging file {}", source_path.display());
         if let Err(err) = fs::remove_file(&source_path) {
-            warn!("Unable to remove staging file {}: {}", source_path.display(), err.description());
+            warn!("Unable to remove staging file {}: {}", source_path.display(), err);
         }
 
         Ok(())

src/overlay.rs

@@ -8,7 +8,6 @@ use std::hash::{Hash, Hasher};
 use std::fmt::{self, Formatter, Display, Debug};
 use std::sync::{Arc, Weak, Mutex};
 use std::collections::HashMap;
-use std::error::Error as StdError;
 use std::ffi::OsStr;
 use std::cmp::max;
 use std::borrow::Cow;
@@ -833,14 +832,14 @@ impl<C> FilesystemOverlay<C> where C: CacheLayer+Debug+Send+Sync+'static,
                 if let Err(ioerr) = fs::remove_dir(&*path.abs_fs_path()) {
                     warn!("Unable to remove overlay directory {} during cleanup: {}",
                           path.abs_fs_path().display(),
-                          ioerr.description());
+                          ioerr);
                 }
             } else if !self.overlay_files.contains_key(path.overlay_path()) {
                 debug!("Removing overlay file {}", path.abs_fs_path().display());
                 if let Err(ioerr) = fs::remove_file(&*path.abs_fs_path()) {
                     warn!("Unable to remove overlay file {} during cleanup: {}",
                           path.abs_fs_path().display(),
-                          ioerr.description());
+                          ioerr);
                 }
             }