This prevents valgrind reports like:
==18426== Conditional jump or move depends on uninitialised value(s)
==18426== at 0x6423EB5: Poco::Data::StatementImpl::execute(bool const&) (in /usr/lib/libPocoDatad.so.46)
==18426== by 0x641DB5F: Poco::Data::Statement::execute(bool) (in /usr/lib/libPocoDatad.so.46)
==18426== by 0x632A0C: Poco::Data::Keywords::now(Poco::Data::Statement&) (Statement.h:443)
==18426== by 0x641C8E5: Poco::Data::Statement::operator,(void (*)(Poco::Data::Statement&)) (in /usr/lib/libPocoDatad.so.46)
...
==18426== Uninitialised value was created by a stack allocation
==18426== at 0x6A1A170: Poco::Data::ODBC::ODBCStatementImpl::affectedRowCount() const (in /usr/lib/libPocoDataODBCd.so.46)
Signed-off-by: Jan Viktorin <viktorin@rehivetech.com>