drm: Driver-specific ioctls range from 0x40 to 0x9f

DRM_COMMAND_END is 0xa0, so the last driver ioctl is 0x9f, not 0x99.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

include/uapi/drm/drm.h

@@ -780,7 +780,7 @@ struct drm_prime_handle {
 
 /**
  * Device specific ioctls should only be in their respective headers
- * The device specific ioctl range is from 0x40 to 0x99.
+ * The device specific ioctl range is from 0x40 to 0x9f.
  * Generic IOCTLS restart at 0xA0.
  *
  * \sa drmCommandNone(), drmCommandRead(), drmCommandWrite(), and