Rm unnecessary p.exist() in ZipArchive::extract

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

src/read.rs

@@ -460,10 +460,8 @@ impl<R: Read + io::Seek> ZipArchive<R> {
                 fs::create_dir_all(&outpath)?;
             } else {
                 if let Some(p) = outpath.parent() {
-                    if !p.exists() {
                     fs::create_dir_all(&p)?;
                 }
-                }
                 let mut outfile = fs::File::create(&outpath)?;
                 io::copy(&mut file, &mut outfile)?;
             }