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 v5.15.86 by commit e0cfe7aa41f3965f5224affd88afd48c60f6ad1f, it was introduced in version v4.10 by commit 51c5d8447bd71b7e539c19c46a03b73c0e91fa66. For more details please see the references link.