diff --git a/src/bin/proxmox-daily-update.rs b/src/bin/proxmox-daily-update.rs
index 99f5152e..83c6b80c 100644
--- a/src/bin/proxmox-daily-update.rs
+++ b/src/bin/proxmox-daily-update.rs
@@ -63,11 +63,8 @@ fn main() {
     let mut rpcenv = CliEnvironment::new();
     rpcenv.set_auth_id(Some(String::from("root@pam")));
 
-    match proxmox_backup::tools::runtime::main(do_update(&mut rpcenv)) {
-        Err(err) => {
-            eprintln!("error during update: {}", err);
-            std::process::exit(1);
-        },
-        _ => (),
+    if let Err(err) = proxmox_backup::tools::runtime::main(do_update(&mut rpcenv)) {
+        eprintln!("error during update: {}", err);
+        std::process::exit(1);
     }
 }
diff --git a/src/bin/proxmox_backup_client/key.rs b/src/bin/proxmox_backup_client/key.rs
index ef3123bb..405cb818 100644
--- a/src/bin/proxmox_backup_client/key.rs
+++ b/src/bin/proxmox_backup_client/key.rs
@@ -315,22 +315,13 @@ fn change_passphrase(
     },
 )]
 /// Print the encryption key's metadata.
-fn show_key(
-    path: Option<String>,
-    param: Value,
-) -> Result<(), Error> {
+fn show_key(path: Option<String>, param: Value) -> Result<(), Error> {
     let path = match path {
         Some(path) => PathBuf::from(path),
-        None => {
-            let path = find_default_encryption_key()?
-                .ok_or_else(|| {
-                    format_err!("no encryption file provided and no default file found")
-                })?;
-            path
-        }
+        None => find_default_encryption_key()?
+            .ok_or_else(|| format_err!("no encryption file provided and no default file found"))?,
     };
 
-
     let config: KeyConfig = serde_json::from_slice(&file_get_contents(path.clone())?)?;
 
     let output_format = get_output_format(&param);
@@ -442,13 +433,8 @@ fn paper_key(
 ) -> Result<(), Error> {
     let path = match path {
         Some(path) => PathBuf::from(path),
-        None => {
-            let path = find_default_encryption_key()?
-                .ok_or_else(|| {
-                    format_err!("no encryption file provided and no default file found")
-                })?;
-            path
-        }
+        None => find_default_encryption_key()?
+            .ok_or_else(|| format_err!("no encryption file provided and no default file found"))?,
     };
 
     let data = file_get_contents(&path)?;
diff --git a/src/bin/proxmox_backup_client/mount.rs b/src/bin/proxmox_backup_client/mount.rs
index 72ed9166..24100752 100644
--- a/src/bin/proxmox_backup_client/mount.rs
+++ b/src/bin/proxmox_backup_client/mount.rs
@@ -345,7 +345,7 @@ fn unmap(
             let mut any = false;
             for (backing, loopdev) in tools::fuse_loop::find_all_mappings()? {
                 let name = tools::systemd::unescape_unit(&backing)?;
-                println!("{}:\t{}", loopdev.unwrap_or("(unmapped)".to_owned()), name);
+                println!("{}:\t{}", loopdev.unwrap_or_else(|| "(unmapped)".to_string()), name);
                 any = true;
             }
             if !any {
diff --git a/src/bin/proxmox_backup_manager/user.rs b/src/bin/proxmox_backup_manager/user.rs
index d68e9e81..6603db1b 100644
--- a/src/bin/proxmox_backup_manager/user.rs
+++ b/src/bin/proxmox_backup_manager/user.rs
@@ -133,7 +133,7 @@ fn list_permissions(param: Value, rpcenv: &mut dyn RpcEnvironment) -> Result<Val
     let output_format = get_output_format(&param);
 
     let info = &api2::access::API_METHOD_LIST_PERMISSIONS;
-    let mut data = match info.handler {
+    let data = match info.handler {
         ApiHandler::Sync(handler) => (handler)(param, info, rpcenv)?,
         _ => unreachable!(),
     };
@@ -161,7 +161,7 @@ fn list_permissions(param: Value, rpcenv: &mut dyn RpcEnvironment) -> Result<Val
             }
         }
     } else {
-        format_and_print_result(&mut data, &output_format);
+        format_and_print_result(&data, &output_format);
     }
 
     Ok(Value::Null)
diff --git a/src/rrd/mod.rs b/src/rrd/mod.rs
index c09efebf..03e4c9de 100644
--- a/src/rrd/mod.rs
+++ b/src/rrd/mod.rs
@@ -1,3 +1,4 @@
+#[allow(clippy::module_inception)]
 mod rrd;
 pub use rrd::*;
 mod cache;