sync code with last improvements from OpenBSD

lib/libXi/man/XChangePointerDevice.txt

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+XCHANGEPOINTERDEVICE(libmansuffix)
+==================================
+
+NAME
+----
+
+   XChangePointerDevice - change which device is the X pointer
+
+SYNOPSIS
+--------
+
+   #include <X11/extensions/XInput.h>
+
+   Status XChangePointerDevice( Display *display,
+                                XDevice *device,
+                                int xaxis,
+                                int yaxis);
+
+   display
+          Specifies the connection to the X server.
+
+   device
+          Specifies the device to be used as the X pointer.
+
+   xaxis
+          Specifies the axis of the device to be used as the X
+          pointer x-axis.
+
+   yaxis
+          Specifies the axis of the device to be used as the X
+          pointer y-axis.
+
+DESCRIPTION
+-----------
+
+   The XChangePointerDevice request causes the server to use the
+   specified device as the X pointer. The device must have been
+   opened by the client via XOpenDevice or a BadDevice error will
+   result. The device must support input class Valuators or a
+   BadMatch error will result. If the implementation does not
+   support use of the specified device as the X pointer, a
+   BadDevice error will result.
+
+   If the specified device is grabbed by another client,
+   AlreadyGrabbed is returned. If the specified device is frozen
+   by a grab on another device, GrabFrozen is returned. If the
+   request is successful, Success is returned.
+
+   If the request succeeds, a ChangeDeviceNotify event is sent to
+   all clients that have selected that event. A MappingNotify
+   event with request = MappingPointer is sent to all clients. The
+   specified device becomes the X pointer, and the old X pointer
+   becomes accessible through the input extension protocol
+   requests.
+
+   XChangePointerDevice can generate a BadDevice or a BadMatch
+   error.
+
+DIAGNOSTICS
+-----------
+
+   BadDevice
+          An invalid device was specified. The specified device
+          does not exist, has not been opened by this client via
+          XOpenInputDevice, or is already one of the core X input
+          devices (pointer or keyboard). This error may also occur
+          if the server implementation does not support using the
+          specified device as the X pointer.
+
+   BadMatch
+          This error may occur if an XChangePointerDevice request
+          was made specifying a device that has less than two
+          valuators, or specifying a valuator index beyond the
+          range supported by the device.
+
+SEE ALSO
+--------
+
+   XChangeKeyboardDevice(libmansuffix)