mmc: alcor: fix return value check of mmc_add_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 29c5b4da41f35108136d843c7432885c78cf8272, it was introduced in version v5.0 by commit c5413ad815a675b5c98a002353d8e96b44b164e9. For more details please see the references link.