Make dinput8 behaviour more correct for mouse and keyboard.
Fix small bug when keyboard buffer overflows.
Use DI_OK instead of 0 for returned values.

dlls/dinput/dinput_private.h

diff --git a/dlls/dinput/dinput_private.h b/dlls/dinput/dinput_private.h
index 1c537a0..918714b 100644
--- a/dlls/dinput/dinput_private.h
+++ b/dlls/dinput/dinput_private.h
@@ -31,12 +31,14 @@
 
    /* Used to have an unique sequence number for all the events */
    DWORD evsequence;
+
+   int version;
 };
 
 /* Function called by all devices that Wine supports */
 typedef struct dinput_device {
   INT pref;
-  BOOL (*enum_device)(DWORD dwDevType, DWORD dwFlags, LPDIDEVICEINSTANCEA lpddi);
+  BOOL (*enum_device)(DWORD dwDevType, DWORD dwFlags, LPDIDEVICEINSTANCEA lpddi, int version);
   HRESULT (*create_device)(IDirectInputAImpl *dinput, REFGUID rguid, REFIID riid, LPDIRECTINPUTDEVICEA* pdev);
 } dinput_device;