Fix handling of return value in TxnCommit/TxnAbort.
Fix handling of return value in TxnCommit/TxnAbort.

In the changes introduced to TxnCommit/TxnAbort due to ownTxn, the
return value was ignored so far due to an oversight.  Correct this.

wiggi/huntercoin,fsb4000/huntercoin,domob1812/huntercoin,chronokings/huntercoin,chronokings/huntercoin,domob1812/huntercoin,chronokings/huntercoin,domob1812/huntercoin,fsb4000/huntercoin,domob1812/huntercoin,wiggi/huntercoin,wiggi/huntercoin,fsb4000/huntercoin,chronokings/huntercoin,fsb4000/huntercoin,wiggi/huntercoin