vsock: prevent null-ptr-deref in vsock_*[has_data|has_space]

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{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/vmw_vsock/af_vsock.c"
                    ],
                    "versions": [
                        {
                            "version": "5.5",
                            "status": "affected"
                        },
                        {
                            "version": "0",
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                        },
                        {
                            "version": "5.10.234",
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                        },
                        {
                            "version": "5.15.177",
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                        },
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                            "version": "6.1.127",
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                        },
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                            "version": "6.6.74",
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                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.11",
                            "lessThanOrEqual": "6.12.*",
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                        {
                            "version": "6.13",
                            "lessThanOrEqual": "*",
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                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }