drm/i915: Fix not finding the VBT when it overlaps with OPREGION_ASLE_EXT

			opregion->vbt_size = vbt_size;

		} else {

			vbt = base + OPREGION_VBT_OFFSET;

			vbt_size = OPREGION_ASLE_EXT_OFFSET - OPREGION_VBT_OFFSET;

			/*

			 * The VBT specification says that if the ASLE ext

			 * mailbox is not used its area is reserved, but

			 * on some CHT boards the VBT extends into the

			 * ASLE ext area. Allow this even though it is

			 * against the spec, so we do not end up rejecting

			 * the VBT on those boards (and end up not finding the

			 * LCD panel because of this).

			 */

			vbt_size = (mboxes & MBOX_ASLE_EXT) ?

				OPREGION_ASLE_EXT_OFFSET : OPREGION_SIZE;

			vbt_size -= OPREGION_VBT_OFFSET;

			if (intel_bios_is_valid_vbt(vbt, vbt_size)) {

				DRM_DEBUG_KMS("Found valid VBT in ACPI OpRegion (Mailbox #4)\n");

				opregion->vbt = vbt;