From 8c17d928eb4602201d02b475caffc63340df849e Mon Sep 17 00:00:00 2001
From: Inada Naoki <songofacandy@gmail.com>
Date: Mon, 4 Mar 2019 01:22:39 +0900
Subject: [PATCH] add missing break statement (GH-12147)

Bug introduced by 848037c.
---
 Modules/_io/textio.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Modules/_io/textio.c b/Modules/_io/textio.c
index 0f0092fd741..8c391659ecd 100644
--- a/Modules/_io/textio.c
+++ b/Modules/_io/textio.c
@@ -2363,6 +2363,8 @@ _io_TextIOWrapper_seek_impl(textio *self, PyObject *cookieObj, int whence)
         cookieObj = _PyObject_CallMethodId((PyObject *)self, &PyId_tell, NULL);
         if (cookieObj == NULL)
             goto fail;
+        break;
+
     case SEEK_END:
         /* seek relative to end of file */
         cmp = PyObject_RichCompareBool(cookieObj, _PyLong_Zero, Py_EQ);
@@ -2401,8 +2403,10 @@ _io_TextIOWrapper_seek_impl(textio *self, PyObject *cookieObj, int whence)
             }
         }
         return res;
+
     case SEEK_SET:
         break;
+
     default:
         PyErr_Format(PyExc_ValueError,
                      "invalid whence (%d, should be %d, %d or %d)", whence,