drm/amdgpu: don't drop the runtime PM reference twice in amdgpu_gpr

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c"
                    ],
                    "versions": [
                        {
                            "version": "9eee152aab56d374edb9ad21b3db05f5cdda2fe6",
                            "lessThan": "652b1f26125fe48aed5f4944698a85b457eef491",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9eee152aab56d374edb9ad21b3db05f5cdda2fe6",
                            "lessThan": "253555a9baccefffe1f6e5f2fe54363c7c01ebb9",
                            "status": "affected",
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                        },
                        {
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                            "lessThan": "de9f6bcdb44f0e410031002e2f103826ea6b6259",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "865e2dbadf6856c9219626fbd6154cac44e5fbca",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5.8.2",
                            "lessThan": "5.9",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c"
                    ],
                    "versions": [
                        {
                            "version": "5.9",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.9",
                            "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"
                        }
                    ]
                }