Hotfix for CVE-2020-3898 am: daaca9ec18 am: bc7048f62c am: 4db92ec1c7

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/libcups/+/11296764

Change-Id: Ic707238814740c2ced5985d0ad7b41450a3aa3d5