warning_fix: fix warnings when build with cargo-1.68.0

Fixes: #6593

Signed-off-by: alex.lyn <alex.lyn@antgroup.com>

src/tools/kata-ctl/src/arch/x86_64/mod.rs

@@ -225,7 +225,7 @@ mod arch_specific {
                 expected_param_value
             );
 
-            return Err(anyhow!("{} {}", error_msg, action_msg));
+            Err(anyhow!("{} {}", error_msg, action_msg))
         }
     }
 

src/tools/kata-ctl/src/ops/exec_ops.rs

@@ -326,9 +326,7 @@ fn setup_client(server_url: String, dbg_console_port: u32) -> anyhow::Result<Uni
             vsock.setup_sock().context("set up vsock")
         }
         // Others will be INVALID URI.
-        _ => {
-            return Err(anyhow!("invalid URI scheme: {:?}", scheme));
-        }
+        _ => Err(anyhow!("invalid URI scheme: {:?}", scheme)),
     }
 }
 

src/tools/kata-ctl/src/ops/volume_ops.rs

@@ -162,7 +162,7 @@ pub fn get_sandbox_id_for_volume(volume_path: &str) -> Result<String> {
         return Ok(String::from(file_name));
     }
 
-    return Err(anyhow!("no sandbox found for {}", volume_path));
+    Err(anyhow!("no sandbox found for {}", volume_path))
 }
 
 #[cfg(test)]

src/tools/kata-ctl/src/utils.rs

@@ -53,7 +53,7 @@ const UNKNOWN: &str = "unknown";
 fn get_field_fn(line: &str, delimiter: &str, file_name: &str) -> Result<String> {
     let fields: Vec<&str> = line.split(delimiter).collect();
     if fields.len() < 2 {
-        return Err(anyhow!("Unexpected file contents for {}", file_name));
+        Err(anyhow!("Unexpected file contents for {}", file_name))
     } else {
         let val = fields[1].trim();
         Ok(String::from(val))