misc clippy fixes

the trivial ones ;)

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

proxmox-file-restore/src/block_driver_qemu.rs

@@ -271,7 +271,7 @@ impl BlockRestoreDriver for QemuBlockDriver {
                         None => {
                             let err = format!(
                                 "invalid JSON received from /status call: {}",
-                                status.to_string()
+                                status
                             );
                             extra["error"] = json!(err);
                         }