Drop data stream before waiting close code

Author: dodomorandi

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "async_ftp"
-version = "4.0.1"
+version = "4.0.2"
 authors = ["Daniel García <[email protected]>", "Matt McCoy <[email protected]>"]
 documentation = "https://docs.rs/async_ftp/"
 repository = "https://github.com/dani-garcia/rust_async_ftp"

src/ftp.rs

@@ -453,6 +453,7 @@ impl FtpStream {
                 Err(err) => return Err(FtpError::ConnectionError(err)),
             };
         }
+        drop(data_stream);
 
         self.read_response_in(close_code).await?;
         Ok(lines)