chore: lint

src/config.rs

@@ -23,7 +23,7 @@
 //! [librdkafka-config]: https://github.com/edenhill/librdkafka/blob/master/CONFIGURATION.md
 
 use std::collections::HashMap;
-use std::ffi::{CStr, CString};
+use std::ffi::CString;
 use std::iter::FromIterator;
 use std::os::raw::c_char;
 use std::ptr;

src/error.rs

@@ -3,7 +3,6 @@
 use std::error::Error;
 use std::ffi::{self, CStr};
 use std::fmt;
-use std::ptr;
 use std::sync::Arc;
 
 use rdkafka_sys as rdsys;