A comment fix in xlogreader.c

While rechecking another patch, I found that 709d003fbd forgot to
edit a comment mentioning three members removed from
XLogReaderState.

See the attached.

regards.

-- 
Kyotaro Horiguchi
NTT Open Source Software Center
diff --git a/src/backend/access/transam/xlogreader.c b/src/backend/access/transam/xlogreader.c
index 27c27303d6..c8b0d2303d 100644
--- a/src/backend/access/transam/xlogreader.c
+++ b/src/backend/access/transam/xlogreader.c
@@ -103,8 +103,7 @@ XLogReaderAllocate(int wal_segment_size, const char *waldir,
     state->read_page = pagereadfunc;
     /* system_identifier initialized to zeroes above */
     state->private_data = private_data;
-    /* ReadRecPtr and EndRecPtr initialized to zeroes above */
-    /* readSegNo, readOff, readLen, readPageTLI initialized to zeroes above */
+    /* ReadRecPtr, EndRecPtr and readLen initialized to zeroes above */
     state->errormsg_buf = palloc_extended(MAX_ERRORMSG_LEN + 1,
                                           MCXT_ALLOC_NO_OOM);
     if (!state->errormsg_buf)