integer overflow in XGetDeviceMotionEvents() [CVE-2013-1984 4/8]

If the number of events or axes reported by the server is large enough
that it overflows when multiplied by the size of the appropriate struct,
then memory corruption can occur when more bytes are copied from the
X server reply than the size of the buffer we allocated to hold them.

Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>

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