mi: closing memory leak, miPointer is freed in miPointerCloseScreen

bugfix: uninitialized pPointer in miPointerGetPosition ifndef MPX
	adding DeviceIntPtr parameter to ScreenRec's cursor functions.
	cleanup of miPointer code to use same scheme in each function

dix:	MPHasCursor() function determines checking whether to invoke
	cursor rendering.

animcur: adding DeviceIntPtr parameter to cursor functions but animcur relies
	 on the core pointer right now.

xfixes: adding DeviceIntPtr parameter to cursor functions but xfixes relies on
	the core pointer right now.

rac:	adding DeviceIntPtr parameter to cursor functions but RAC relies on
	the core pointer right now.

ramdac:	adding DeviceIntPtr parameter to cursor functions but ramdac relies on
	the core pointer right now.

include/cursor.h

@@ -131,6 +131,7 @@ extern void CheckCursorConfinement(
     WindowPtr /*pWin*/);
 
 extern void NewCurrentScreen(
+    struct _DeviceIntRec* /*pDev*/,
     ScreenPtr /*newScreen*/,
     int /*x*/,
     int /*y*/);

include/dix.h

@@ -821,4 +821,8 @@ extern int xstrcasecmp(char *s1, char *s2);
 /* ffs.c */
 extern int ffs(int i);
 
+#ifdef MPX
+extern Bool MPHasCursor(DeviceIntPtr pDev);
+#endif
+
 #endif /* DIX_H */

include/inputstr.h

@@ -330,7 +330,7 @@ typedef struct _DeviceIntRec {
     int			nPrivates;
     DeviceUnwrapProc    unwrapProc;
 #ifdef MPX
-    Bool        isMPDev;                /* TRUE if multipointer device */
+    Bool                isMPDev;           /* TRUE if multipointer device */
 #endif
 } DeviceIntRec;
 

include/scrnintstr.h

@@ -121,6 +121,7 @@ typedef    void (* GetSpansProcPtr)(
 	char * /*pdstStart*/);
 
 typedef    void (* PointerNonInterestBoxProcPtr)(
+        DeviceIntPtr /*pDev*/,
 	ScreenPtr /*pScreen*/,
 	BoxPtr /*pBox*/);
 
@@ -262,29 +263,35 @@ typedef    void (* ConstrainCursorProcPtr)(
 	BoxPtr /*pBox*/);
 
 typedef    void (* CursorLimitsProcPtr)(
+        DeviceIntPtr /* pDev */,
 	ScreenPtr /*pScreen*/,
 	CursorPtr /*pCursor*/,
 	BoxPtr /*pHotBox*/,
 	BoxPtr /*pTopLeftBox*/);
 
 typedef    Bool (* DisplayCursorProcPtr)(
+        DeviceIntPtr /* pDev */,
 	ScreenPtr /*pScreen*/,
 	CursorPtr /*pCursor*/);
 
 typedef    Bool (* RealizeCursorProcPtr)(
+        DeviceIntPtr /* pDev */,
 	ScreenPtr /*pScreen*/,
 	CursorPtr /*pCursor*/);
 
 typedef    Bool (* UnrealizeCursorProcPtr)(
+        DeviceIntPtr /* pDev */,
 	ScreenPtr /*pScreen*/,
 	CursorPtr /*pCursor*/);
 
 typedef    void (* RecolorCursorProcPtr)(
+        DeviceIntPtr /* pDev */,
 	ScreenPtr /*pScreen*/,
 	CursorPtr /*pCursor*/,
 	Bool /*displayed*/);
 
 typedef    Bool (* SetCursorPositionProcPtr)(
+        DeviceIntPtr /* pDev */,
 	ScreenPtr /*pScreen*/,
 	int /*x*/,
 	int /*y*/,