Fixes a potential content store bug, backported from 1.2 - v1.1.3 release notes: https://github.com/containerd/containerd/releases/tag/v1.1.3 - v1.1.4 release notes: https://github.com/containerd/containerd/releases/tag/v1.1.4 Signed-off-by: Sebastiaan van Stijn <github@gone.nl> (cherry picked from commit b3c3c7a5a310ba340f1a86a4a708de34b9602e74) Signed-off-by: Sebastiaan van Stijn <github@gone.nl> Upstream-commit: a4decd0c4cd6033907fe85576a3d7dc8990aa758 Component: engine