As of kernel commit

    commit a679064a7e9e8799177a64a31668a34a1bc6a4f1
    Author: Matt Roper <matthew.d.roper@intel.com>
    Date:   Fri Jan 30 16:22:37 2015 -0800

        drm/i915: Switch planes from transitional helpers to full atomic helpers

the kernel now checks for cursor coordinates that would result in
integer overflow and returns -ERANGE, similar to the checking that was
already done for other plane types.  We update kms_cursor_crc here to
reflect this small behavior change:
 * Check for success at extreme boundary conditions INT_MAX-{width,height}
   rather than INT_MAX
 * Add new check for success at SHRT_MAX; if the driver were to
   internally use short values and overflow, we could have the cursor
   reappear on the screen.
 * Add a test for failure with proper error code at INT_MAX-{width,height}+1

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>