mmc: rtsxusbsdmmc: 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 1491667d5450778a265eddddd294219acfd648cb, it was introduced in version v3.16 by commit 1d14310abb74011dc5523baf0aee75b94070861a. For more details please see the references link.