hwrng: xilinx-trng - propagate timeout before any data is read

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/char/hw_random/xilinx-trng.c"
                    ],
                    "versions": [
                        {
                            "version": "8979744aca8096ee5072798dfc1181606919b35d",
                            "lessThan": "62219775a07ce0bd8085852f3d1e2d772bf6fdec",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8979744aca8096ee5072798dfc1181606919b35d",
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                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8979744aca8096ee5072798dfc1181606919b35d",
                            "lessThan": "ba088974419326daf46c5dc03e2cf6ab6ab701f7",
                            "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/char/hw_random/xilinx-trng.c"
                    ],
                    "versions": [
                        {
                            "version": "6.18",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.18",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.52",
                            "lessThanOrEqual": "6.18.*",
                            "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"
                        }
                    ]
                }