Attached a patch for $SUBJECT.

- * If RecPtr is not NULL, try to read a record at that position.  Otherwise
+ * If RecPtr is valid, try to read a record at that position.  Otherwise

Commit 4d6d425ab8d addressed the comment above XLogReadRecord() in
xlogreader.c, but missed the same above ReadRecord() in xlog.c.

Backpatchable to 9.3, I'd think.

Thanks,
Amit
diff --git a/src/backend/access/transam/xlog.c 
b/src/backend/access/transam/xlog.c
index 70d2570dc2..197e9cc726 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -4132,7 +4132,7 @@ CleanupBackupHistory(void)
 /*
  * Attempt to read an XLOG record.
  *
- * If RecPtr is not NULL, try to read a record at that position.  Otherwise
+ * If RecPtr is valid, try to read a record at that position.  Otherwise
  * try to read a record just after the last one previously read.
  *
  * If no valid record is available, returns NULL, or fails if emode is PANIC.
-- 
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