malloc in xlog.c

I see a few malloc's in backend/access/transam/xlog.c that don't check
to see if malloc returns NULL/failure.  I think there should be at least
an Assert() in there.

Also, seems we use malloc() a few other places where palloc should be
used, like variable.c.  Is that correct?

--  Bruce Momjian                        |  http://candle.pha.pa.us pgman@candle.pha.pa.us               |  (610)
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