release-upload: remove uneeded decode which blows up

Author: cirosantilli

release-upload

@@ -23,7 +23,7 @@ https://github.com/cirosantilli/linux-kernel-module-cheat#release-upload
             'describe',
             '--exact-match',
             '--tags'
-        ]).decode().rstrip()
+        ]).rstrip()
         upload_path = self.env['release_zip_file']
 
         # Check the release already exists.