Fix lints for latest version of rust (#50)

* Fix unexpected_cfgs lints

* Fix static_mut_refs lints

* Allow dead_code lint for pinned callbacks

Cargo.toml

@@ -31,3 +31,6 @@ version = '0.2.0'
 
 [badges.maintenance]
 status = 'passively-maintained'
+
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(abi4)', 'cfg(abi5)', 'cfg(abi6)'] }

src/lib.rs

@@ -41,6 +41,7 @@ use num_traits::ToPrimitive;
 use std::convert::{TryFrom, TryInto};
 use std::ffi::{CStr, CString};
 use std::os::raw::c_void;
+use std::ptr::addr_of_mut;
 use std::time::Duration;
 use std::{mem, result};
 
@@ -1074,7 +1075,7 @@ pub enum CecConnectionResultError {
 pub struct CecConnection(
     pub CecConnectionCfg,
     libcec_connection_t,
-    Pin<Box<CecCallbacks>>,
+    #[allow(dead_code)] Pin<Box<CecCallbacks>>,
 );
 
 impl CecConnection {
@@ -1325,14 +1326,14 @@ impl CecConnectionCfg {
             libcec_sys::libcec_enable_callbacks(
                 connection.1,
                 rust_callbacks_as_void_ptr,
-                &mut CALLBACKS,
+                addr_of_mut!(CALLBACKS),
             )
         };
         #[cfg(not(abi4))]
         let callback_ret = unsafe {
             libcec_sys::libcec_set_callbacks(
                 connection.1,
-                &mut CALLBACKS,
+                addr_of_mut!(CALLBACKS),
                 rust_callbacks_as_void_ptr,
             )
         };