Incorrect return code for error on call of commit during 2PC

Hi,

it seems that PostgreSQL jdbc driver returns incorrect code during on call of commit during 2PC. Currently the driver returns XAER_RMERR.
I expect that it's this call
https://github.com/pgjdbc/pgjdbc/blob/master/org/postgresql/xa/PGXAConnection.java#L528

But the XA spec says for XAER_RMERR that