dinput: AddRef and Release parent DirectInput class.

[Vitaliy Margolen]

This fixes bug 6918.
---
 dlls/dinput/joystick_linuxinput.c |    5 +++++
 dlls/dinput/keyboard.c            |    8 ++++++++
 dlls/dinput/mouse.c               |    5 +++++
 3 files changed, 18 insertions(+), 0 deletions(-)
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