qcap/capturegraph: Return E_POINTER when ICaptureGraphBuilder2::FindInterface() is called with NULL filter.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=46950Signed-off-by: Gijs Vermeulen <gijsvrm@gmail.com>
Signed-off-by: Zebediah Figura <z.figura12@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>