igc: don't fail igc_probe() on LED setup error

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/ethernet/intel/igc/igc.h",
                        "drivers/net/ethernet/intel/igc/igc_main.c"
                    ],
                    "versions": [
                        {
                            "version": "ea578703b03d5d651b091c39f717dc829155b520",
                            "lessThan": "bec504867acc7315de9cd96ef9161fa52a25abe8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ea578703b03d5d651b091c39f717dc829155b520",
                            "lessThan": "f05e82d8553232cef150a6dbb70ed67d162abb2b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ea578703b03d5d651b091c39f717dc829155b520",
                            "lessThan": "528eb4e19ec0df30d0c9ae4074ce945667dde919",
                            "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/net/ethernet/intel/igc/igc.h",
                        "drivers/net/ethernet/intel/igc/igc_main.c"
                    ],
                    "versions": [
                        {
                            "version": "6.9",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.9",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.49",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.16.9",
                            "lessThanOrEqual": "6.16.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.17",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }