SQL_DATA_AT_EXEC processing broken for large objects in nightly git

Hi,

the nightly git of the psqlODBC driver appears to no longer support
insertion into LO columns when using SQL_DATA_AT_EXEC mode.  The latest
released driver version - psqlodbc-09.03.0400 - works.  I've tested this
against both PostgreSQL 9.4.4 and 9.4.5 on openSUSE 13.2.

An adapted variant of the large-object-test.c program that uses
SQL_DATA_AT_EXEC mode is attached. When run as part of the regression
test suite against psqlodbc-09.03.0400, both the
large-object-data-at-exec-test.c test completes successfully, just like
large-object-test.c, and produces the following output in
test/results/large-object-data-at-exec.out:

\! "./src/large-object-data-at-exec-test"
connected
inserting large object...
reading it back...
hex: 0102030405060708
disconnecting

However, when run as part of the regression test suite against nightly
git build of psqlodbc, the large-object-data-at-exec-test.c test fails,
unlike large-object-test.c,  and produces the following output in
test/results/large-object-data-at-exec.out:

connected
inserting large object...
SQLParamData failed (final call)
HY000=unexpected NULL parameter value

Regards,
Vadym