mmc: meson-gx: 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 64b2c441171febf075bd9632aca579afda8ab9fb, it was introduced in version v4.10 by commit 51c5d8447bd71b7e539c19c46a03b73c0e91fa66. For more details please see the references link.