mmc: rtsxpci: fix return value check of mmcadd_host()
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 v5.15.86 by commit 30dc645461dfc63e52b3af8ee4a98e17bf14bacf, it was introduced in version v3.8 by commit ff984e57d36e8ac468849a144a36f1c11f88b61c. For more details please see the references link.