clippy: use rewind instead of seek 0

dump/src/lib.rs

@@ -198,7 +198,7 @@ impl From<KindWithContent> for KindDump {
 #[cfg(test)]
 pub(crate) mod test {
     use std::fs::File;
-    use std::io::{Seek, SeekFrom};
+    use std::io::Seek;
     use std::str::FromStr;
 
     use big_s::S;
@@ -410,7 +410,7 @@ pub(crate) mod test {
         // create the dump
         let mut file = tempfile::tempfile().unwrap();
         dump.persist_to(&mut file).unwrap();
-        file.seek(SeekFrom::Start(0)).unwrap();
+        file.rewind().unwrap();
 
         file
     }

dump/src/reader/v5/mod.rs

@@ -33,7 +33,7 @@
 //!
 
 use std::fs::{self, File};
-use std::io::{BufRead, BufReader, ErrorKind, Seek, SeekFrom};
+use std::io::{BufRead, BufReader, ErrorKind, Seek};
 use std::path::Path;
 
 use serde::{Deserialize, Serialize};
@@ -178,7 +178,7 @@ impl V5Reader {
     }
 
     pub fn keys(&mut self) -> Result<Box<dyn Iterator<Item = Result<Key>> + '_>> {
-        self.keys.seek(SeekFrom::Start(0))?;
+        self.keys.rewind()?;
         Ok(Box::new(
             (&mut self.keys).lines().map(|line| -> Result<_> { Ok(serde_json::from_str(&line?)?) }),
         ))