Fix an oversight in ReorderBufferFinishPrepared.
We don't have anything to decode in a transaction if ReorderBufferTXN
doesn't exist by the time we decode the commit prepared. So don't create a
new ReorderBufferTXN here. This is an oversight in commit
a271a1b5.
Reported-by: Markus Wanner
Discussion: https://postgr.es/m/
dbec82e2-dbd7-95a2-c6b6-
e488cbbdf853@bluegap.ch