Add missing include, No null from create_sample #246

Add missing include, No null from create_sample

Usage Workflow file

7 errors

'RETCODE_OK': is not a member of 'N::DDS' [D:\a\OpenDDS\OpenDDS\OpenDDS\tests\DCPS\Compiler\namespace_conflict\DDS_Namespace_Conflict.vcxproj]

'RETCODE_OK': undeclared identifier [D:\a\OpenDDS\OpenDDS\OpenDDS\tests\DCPS\Compiler\namespace_conflict\DDS_Namespace_Conflict.vcxproj]

'DynamicDataFactory': is not a member of 'DDS' [D:\a\OpenDDS\OpenDDS\OpenDDS\tests\DCPS\Compiler\xcdr\xcdr.vcxproj]

'DynamicDataFactory': the symbol to the left of a '::' must be a type [D:\a\OpenDDS\OpenDDS\OpenDDS\tests\DCPS\Compiler\xcdr\xcdr.vcxproj]

'get_instance': is not a member of 'DDS' [D:\a\OpenDDS\OpenDDS\OpenDDS\tests\DCPS\Compiler\xcdr\xcdr.vcxproj]

'get_instance': identifier not found [D:\a\OpenDDS\OpenDDS\OpenDDS\tests\DCPS\Compiler\xcdr\xcdr.vcxproj]

Process completed with exit code 1.