drm/i915: Fix -Wstringop-overflow warning in call to intelreadwm_latency()
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v4.9.317 by commit 2441cedd2941c43c670252cc1761c6dc299b699f. For more details please see the references link.