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 v6.0.16 by commit 42343e3c6195e934b9cb4c08b7ff84a3778d77f9, it was introduced in version v4.10 by commit 51c5d8447bd71b7e539c19c46a03b73c0e91fa66. For more details please see the references link.