spi: tegra210-quad: Protect curr_xfer in tegra_qspi_combined_seq_xfer

{
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                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/spi/spi-tegra210-quad.c"
                    ],
                    "versions": [
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                        {
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                        {
                            "version": "bb0c58be84f907285af45657c1d4847b960a12bf",
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                        },
                        {
                            "version": "6.17.13",
                            "lessThan": "6.18",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/spi/spi-tegra210-quad.c"
                    ],
                    "versions": [
                        {
                            "version": "5.15.198",
                            "lessThan": "5.15.200",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.160",
                            "lessThan": "6.1.163",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.120",
                            "lessThan": "6.6.124",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.63",
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                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.2",
                            "lessThan": "6.18.10",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }