Remove unused import and apply rust fmt

Author: JulianSchmid

etherparse/src/err/from_slice_error.rs

@@ -329,9 +329,9 @@ mod tests {
     use crate::{ArpHardwareId, LenSource};
 
     use super::{FromSliceError::*, *};
+    use core::error::Error;
     use core::hash::{Hash, Hasher};
     use std::collections::hash_map::DefaultHasher;
-    use core::error::Error;
     use std::format;
 
     #[test]

etherparse/src/err/ip/header_error.rs

@@ -1,6 +1,3 @@
-#[cfg(feature = "std")]
-use crate::*;
-
 /// Error when decoding the IP header part of a message.
 #[derive(Clone, Debug, Eq, PartialEq, Hash)]
 pub enum HeaderError {