avoid multiple return

Author: zhiqiangxu

pandas/core/common.py

@@ -90,9 +90,11 @@ def consensus_name_attr(objs):
     for obj in objs[1:]:
         try:
             if obj.name != name:
-                return None
+                name = None
+                break
         except ValueError:
-            return None
+            name = None
+            break
     return name