dma-debug: fix sg checks in debugdmamap_sg()
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 v4.19.214 by commit db9aadf3bb8d7c1def4813f142cba9cf94be2999, it was introduced in version v2.6.31 by commit 884d05970bfbc3db368f23460dc4ce63257f240d. For more details please see the references link.