diff --git a/src/ceph_client.rs b/src/ceph_client.rs
index 25499d0..732124f 100644
--- a/src/ceph_client.rs
+++ b/src/ceph_client.rs
@@ -46,7 +46,7 @@ impl CephClient {
         user_id: T1,
         config_file: T2,
     ) -> Result<CephClient, RadosError> {
-        let rados_t = match connect_to_ceph(&user_id.as_ref(), &config_file.as_ref()) {
+        let rados_t = match connect_to_ceph(user_id.as_ref(), config_file.as_ref()) {
             Ok(rados_t) => rados_t,
             Err(e) => return Err(e),
         };
@@ -170,11 +170,11 @@ impl CephClient {
     /// # }
     /// ```
     pub fn osd_unset(&self, key: OsdOption) -> Result<(), RadosError> {
-        cmd::osd_unset(&self.rados_t, &key, self.simulate).map_err(|a| a)
+        cmd::osd_unset(&self.rados_t, &key, self.simulate)
     }
 
     pub fn osd_tree(&self) -> Result<cmd::CrushTree, RadosError> {
-        cmd::osd_tree(&self.rados_t).map_err(|a| a)
+        cmd::osd_tree(&self.rados_t)
     }
 
     /// Get cluster status
diff --git a/src/cmd.rs b/src/cmd.rs
index e134b83..6e7cedd 100644
--- a/src/cmd.rs
+++ b/src/cmd.rs
@@ -1376,10 +1376,7 @@ pub fn osd_safe_to_destroy(cluster_handle: &Rados, osd_id: u64) -> bool {
         "prefix": "osd safe-to-destroy",
         "ids": [osd_id.to_string()]
     });
-    match cluster_handle.ceph_mon_command_without_data(&cmd) {
-        Err(_) => false,
-        Ok(_) => true,
-    }
+    cluster_handle.ceph_mon_command_without_data(&cmd).is_ok()
 }
 
 /// count ceph-mgr daemons by metadata field property
diff --git a/src/error.rs b/src/error.rs
index a48d2ff..cc3ad7d 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -50,7 +50,7 @@ impl fmt::Display for RadosError {
         match *self {
             RadosError::FromUtf8Error(ref e) => f.write_str(&e.to_string()),
             RadosError::NulError(ref e) => f.write_str(&e.to_string()),
-            RadosError::Error(ref e) => f.write_str(&e),
+            RadosError::Error(ref e) => f.write_str(e),
             RadosError::IoError(ref e) => f.write_str(&e.to_string()),
             RadosError::ApiError(ref e) => e.fmt(f),
             RadosError::IntoStringError(ref e) => f.write_str(&e.to_string()),