dix: freeing a null grab is a bug, complain if doing so
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
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@ -249,6 +249,8 @@ CreateGrab(int client, DeviceIntPtr device, DeviceIntPtr modDevice,
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void
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FreeGrab(GrabPtr pGrab)
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{
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BUG_RETURN(!pGrab);
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if (pGrab->grabtype == XI2 && pGrab->type == XI_TouchBegin)
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TouchListenerGone(pGrab->resource);
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