drm/i915: Fix request ref counting during error capture & debugfs dump

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/gpu/drm/i915/gt/intel_context.c",
                        "drivers/gpu/drm/i915/gt/intel_context.h",
                        "drivers/gpu/drm/i915/gt/intel_engine_cs.c",
                        "drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c",
                        "drivers/gpu/drm/i915/i915_gpu_error.c"
                    ],
                    "versions": [
                        {
                            "version": "573ba126aef37c8315e5bb68d2dad515efa96994",
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                            "status": "affected",
                            "versionType": "git"
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                        {
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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/gpu/drm/i915/gt/intel_context.c",
                        "drivers/gpu/drm/i915/gt/intel_context.h",
                        "drivers/gpu/drm/i915/gt/intel_engine_cs.c",
                        "drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c",
                        "drivers/gpu/drm/i915/i915_gpu_error.c"
                    ],
                    "versions": [
                        {
                            "version": "5.15",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.15",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.11",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }