dix: Remove InitSprite, work can be done by InitializeSprite.

Free sprite struct if a spriteOwner is paired.

xfree86: Use PairDevices instead of passing booleans around when creating a
         sprite.

Xext:    Switch back to using LookupPointer/KeyboardDevice instead of
         inputInfo.xyz.

include/inputstr.h

@@ -355,7 +355,7 @@ typedef struct _DeviceIntRec {
     int			nPrivates;
     DeviceUnwrapProc    unwrapProc;
     Bool                isMPDev;           /* TRUE if multipointer device */
-    /* Each devices has a sprite. However, keyboards and shared pointers do
+    /* Each device has a sprite. However, keyboards and shared pointers do
        not in fact own a sprite but rather have their pointer set to the
        sprite of another device. pSprite always has to point to a valid
        sprite. spriteOwner indicates whether it is the device's sprite. */