ath5k: fix OOB in ath5keepromreadpcalinfo_5111
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 v4.19.238 by commit 25efc5d03455c3839249bc77fce5e29ecb54677e. For more details please see the references link.