mmc: wmt-sdmmc: 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 b40ac3b696a9c84b36211ef0c3f5a422650c101b, it was introduced in version v3.8 by commit 3a96dff0f828ae9dfb43efd49a9b67a74c6dc360. For more details please see the references link.