mmc: toshsd: 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 647e370dd0ef7e212d8d014bda748e461eab2e8c, it was introduced in version v3.19 by commit a5eb8bbd66ccf9f169419f9652544aec771b7c57. For more details please see the references link.