eth: bnxt: always recalculate features after XDP clearing, fix null-deref

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/ethernet/broadcom/bnxt/bnxt.c",
                        "drivers/net/ethernet/broadcom/bnxt/bnxt.h",
                        "drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c"
                    ],
                    "versions": [
                        {
                            "version": "1054aee82321483dceabbb9b9e5d6512e8fe684b",
                            "lessThan": "076a694a42ae3f0466bc6e4126050eeb7b7d299a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "1054aee82321483dceabbb9b9e5d6512e8fe684b",
                            "lessThan": "90336fc3d6f5e716ac39a9ddbbde453e23a5aa65",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "1054aee82321483dceabbb9b9e5d6512e8fe684b",
                            "lessThan": "08831a894d18abfaabb5bbde7c2069a7fb41dd93",
                            "status": "affected",
                            "versionType": "git"
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                        {
                            "version": "1054aee82321483dceabbb9b9e5d6512e8fe684b",
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                            "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/broadcom/bnxt/bnxt.c",
                        "drivers/net/ethernet/broadcom/bnxt/bnxt.h",
                        "drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c"
                    ],
                    "versions": [
                        {
                            "version": "4.16",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.16",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.167",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.130",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.11",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.13",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }