Update fsspec/implementations/sftp.py

Author: martindurant

fsspec/implementations/sftp.py

@@ -174,6 +174,7 @@ def _rm(self, path):
 
     def mv(self, old, new):
         new = self._strip_protocol(new)
+        old = self._strip_protocol(old)
         logger.debug("Renaming %s into %s", old, new)
         self.ftp.posix_rename(old, new)