pg_waldump error message fix

Hi,

I noticed that when pg_waldump finds an invalid record, the
corresponding error message seems to point to the last valid record
read.

rmgr: ... lsn: 0/090E5AF8, prev 0/090E59D0, ...
pg_waldump: fatal: error in WAL record at 0/90E5AF8: invalid record length at 0/90E5B30: wanted 24, got 0

Should pg_waldump report currRecPtr instead of ReadRecPtr in the error
message? With that, I see the following.

rmgr: ... lsn: 0/090E5AF8, prev 0/090E59D0, ...
pg_waldump: fatal: error in WAL record at 0/90E5B30: invalid record length at 0/90E5B30: wanted 24, got 0

Here is the patch:

diff --git a/src/bin/pg_waldump/pg_waldump.c b/src/bin/pg_waldump/pg_waldump.c
index 31e99c2a6d..27da60e6db 100644
--- a/src/bin/pg_waldump/pg_waldump.c
+++ b/src/bin/pg_waldump/pg_waldump.c
@@ -1110,8 +1110,8 @@ main(int argc, char **argv)

if (errormsg)
fatal_error("error in WAL record at %X/%X: %s",
- (uint32) (xlogreader_state->ReadRecPtr >> 32),
- (uint32) xlogreader_state->ReadRecPtr,
+ (uint32) (xlogreader_state->currRecPtr >> 32),
+ (uint32) xlogreader_state->currRecPtr,
errormsg);

XLogReaderFree(xlogreader_state);

Nathan