render: Don't filter 0 return from GetTimeInMillis

In animate cursor block handler code assumes GetTimeInMillis returns
always nonzero value. This isn't true when time wraps around.

To prevent any problems in case GetTimeInMillis would return zero use
activeDevice variable to track if we have received time.

Signed-off-by: Pauli Nieminen <ext-pauli.nieminen@nokia.com>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>
(cherry picked from commit aa8cea9)

render/animcur.c

@@ -150,14 +150,18 @@ AnimCurScreenBlockHandler (int screenNum,
     ScreenPtr		pScreen = screenInfo.screens[screenNum];
     AnimCurScreenPtr    as = GetAnimCurScreen(pScreen);
     DeviceIntPtr        dev;
+    Bool                activeDevice = FALSE;
     CARD32              now = 0, 
                         soonest = ~0; /* earliest time to wakeup again */
 
     for (dev = inputInfo.devices; dev; dev = dev->next)
     {
 	if (IsPointerDevice(dev) && pScreen == dev->spriteInfo->anim.pScreen)
 	{
-	    if (!now) now = GetTimeInMillis (); 
+	    if (!activeDevice) {
+                now = GetTimeInMillis ();
+                activeDevice = TRUE;
+            }
 
 	    if ((INT32) (now - dev->spriteInfo->anim.time) >= 0)
 	    {
@@ -187,7 +191,7 @@ AnimCurScreenBlockHandler (int screenNum,
 	}
     }
 
-    if (now)
+    if (activeDevice)
         AdjustWaitForDelay (pTimeout, soonest - now);
 
     Unwrap (as, pScreen, BlockHandler);