Spotted by Gerald Pfeifer.

Found by Detlef Riekenberg.

BSD socket SO_REUSEADDR is not a complete match, but features like
"allow binding to a port immediately after closing it" seem to be compatible.

For now, those pointers are always null, anyway.

This patch initializes allocated pointers in PointerUnmarshall since later
code checks the value for NULL (specifically, NdrConformantArrayUnmarshall).

This initializes the memory for an [in] parameter.