dm raid1: reserve space for NUL-terminator in build_constructor_string()

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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/md/dm-log-userspace-base.c"
                    ],
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                            "versionType": "original_commit_for_fix"
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                }