clippy fix

src/main.rs

@@ -180,7 +180,7 @@ impl BlobManager {
             b.append(input);
             return Ok(());
         }
-        return Err(BlobError::BlobDNE);
+        Err(BlobError::BlobDNE)
     }
 
     pub fn read(&mut self, id: usize, start: usize, len: usize) -> Result<Vec<u8>, BlobError> {