iio: dac: ad5686: missing NULL check on match data

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/iio/dac/ad5686-spi.c",
                        "drivers/iio/dac/ad5696-i2c.c"
                    ],
                    "versions": [
                        {
                            "version": "0eb1728461a1a84613188f394e38921e29325d30",
                            "lessThan": "cdaa9cb77eb67f2d4921600f6531315040888e29",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0eb1728461a1a84613188f394e38921e29325d30",
                            "lessThan": "572a008526359cdac2fa935dad75e9d50a79792f",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/iio/dac/ad5686-spi.c",
                        "drivers/iio/dac/ad5696-i2c.c"
                    ],
                    "versions": [
                        {
                            "version": "7.2",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "7.2",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.6",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }