Fixed typo.

Signed-off-by: Cristiano Urban <cristiano.urban@inaf.it>

transfer_service/tape_client.py

@@ -69,7 +69,7 @@ class TapeClient(object):
                 pool.lowSpaceWarningThreshold = el["low_space_warning_threshold"]
                 pool.noSpaceWarningEnable = el["no_space_warning_enable"]
                 pool.mode = el["mode"]
-                self.poolList.append(task)
+                self.poolList.append(pool)
             return self.poolList.copy()
         else:
             sys.exit("cmd_exit_code = FAILURE")