NFSv4: Prevent NULL-pointer dereference in nfs42_complete_copies()

{
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                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                        "fs/nfs/client.c",
                        "fs/nfs/nfs42proc.c",
                        "fs/nfs/nfs4state.c",
                        "include/linux/nfs_fs_sb.h"
                    ],
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{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/nfs/client.c",
                        "fs/nfs/nfs42proc.c",
                        "fs/nfs/nfs4state.c",
                        "include/linux/nfs_fs_sb.h"
                    ],
                    "versions": [
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                            "version": "5.5",
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                        },
                        {
                            "version": "5.15.168",
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                        {
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                            "versionType": "original_commit_for_fix"
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                    ]
                }