ovpn: defer key slot crypto freeing to workqueue

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/ovpn/crypto.c",
                        "drivers/net/ovpn/crypto.h",
                        "drivers/net/ovpn/crypto_aead.c",
                        "drivers/net/ovpn/crypto_aead.h"
                    ],
                    "versions": [
                        {
                            "version": "8534731dbf2d52a539b94defd06d2a8d3514aacb",
                            "lessThan": "5cea365559449f2149ab724d33d406e3ec4c00c9",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8534731dbf2d52a539b94defd06d2a8d3514aacb",
                            "lessThan": "0f77ed5ee91946ea63e29f2e0ff9dc9e722d8da3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8534731dbf2d52a539b94defd06d2a8d3514aacb",
                            "lessThan": "2da3dfa1ddfe55a065f484750c83660e3bd4ac00",
                            "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/ovpn/crypto.c",
                        "drivers/net/ovpn/crypto.h",
                        "drivers/net/ovpn/crypto_aead.c",
                        "drivers/net/ovpn/crypto_aead.h"
                    ],
                    "versions": [
                        {
                            "version": "6.16",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.16",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.57",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.10",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }