drm/exec: don't immediately add prelocked obj to array of locked objs

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/gpu/drm/drm_exec.c",
                        "include/drm/drm_exec.h"
                    ],
                    "versions": [
                        {
                            "version": "09593216bff15866f95c8ad406cb7fdcec1ee40a",
                            "lessThan": "96d9996e5dbcfabed052c0d9377a382c95fed607",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "09593216bff15866f95c8ad406cb7fdcec1ee40a",
                            "lessThan": "7a10cd79c4d9a90334fece32fef3a8e5b1a9727b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "09593216bff15866f95c8ad406cb7fdcec1ee40a",
                            "lessThan": "26401a4999f1596a515b2e704e7066ac09306488",
                            "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/gpu/drm/drm_exec.c",
                        "include/drm/drm_exec.h"
                    ],
                    "versions": [
                        {
                            "version": "6.6",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.6",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.59",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.13",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }