warnings and clippy fixups

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

build.rs

@@ -16,7 +16,7 @@ fn main() {
 
     cbindgen::Builder::new()
         .with_language(cbindgen::Language::C)
-        .with_crate(&crate_dir)
+        .with_crate(crate_dir)
         .with_header(header)
         .with_include_guard("PROXMOX_BACKUP_QEMU_H")
         .exclude_item("wakeup_callback")

src/lib.rs

@@ -759,7 +759,7 @@ pub extern "C" fn proxmox_backup_finish_async(
 pub extern "C" fn proxmox_backup_disconnect(handle: *mut ProxmoxBackupHandle) {
     let task = handle as *mut Arc<BackupTask>;
 
-    unsafe { Box::from_raw(task) }; // take ownership, drop(task)
+    drop(unsafe { Box::from_raw(task) }); // take ownership, drop(task)
 }
 
 // Simple interface to restore data

src/restore.rs

@@ -252,7 +252,7 @@ impl RestoreTask {
         let info = ImageAccessInfo {
             archive_size,
             _archive_name: archive_name,
-            /// useful to debug
+            // useful to debug
             reader,
         };