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 v5.10.163 by commit 9bedf64dda84b29151e41591d8ded9ff0e6d336a, it was introduced in version v3.8 by commit 3a96dff0f828ae9dfb43efd49a9b67a74c6dc360. For more details please see the references link.