dinput: AddRef and Release parent DirectInput class.[try 2]

[Vitaliy Margolen]

Last try was missing Release in tests, which triggered test failure.

And don't forget to free memory on error.
This fixes bug 6918.
---
 dlls/dinput/joystick_linux.c      |    4 ++--
 dlls/dinput/joystick_linuxinput.c |    4 ++++
 dlls/dinput/keyboard.c            |   10 +++++++++-
 dlls/dinput/mouse.c               |    5 +++++
 dlls/dinput/tests/keyboard.c      |    2 ++
 dlls/dinput/tests/mouse.c         |    4 +++-
 6 files changed, 25 insertions(+), 4 deletions(-)
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