mmc: atmel-mci: 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 v5.15.86 by commit 1925472dec31ec061d57412b3a65a056ea24f340, it was introduced in version v2.6.27 by commit 7d2be0749a59096a334c94dc48f43294193cb8ed. For more details please see the references link.