Add back missing return in ObjectClient

Change-Id: Ifdbdc65406e466d77882cf9cebe4a5a4ac29576a
diff --git a/tempest/services/object_storage/object_client.py b/tempest/services/object_storage/object_client.py
index 056dcec..edfb234 100644
--- a/tempest/services/object_storage/object_client.py
+++ b/tempest/services/object_storage/object_client.py
@@ -138,6 +138,7 @@
                                                              sig, expires)
 
         resp, body = self.get(url)
+        return resp, body
 
     def create_object_segments(self, container, object_name, segment, data):
         """Creates object segments."""