mmc: vub300: fix return value check of mmcaddhost()
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 v6.0.16 by commit c9e85979b59cb86f0a15defa8199d740e2b36b90, it was introduced in version v3.0 by commit 88095e7b473a3d9ec3b9c60429576e9cbd327c89. For more details please see the references link.