wifi: brcmfmac: make release_scratchbuffers idempotent

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                        "drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c"
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{
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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c"
                    ],
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                            "version": "5.2",
                            "status": "affected"
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                            "version": "0",
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                            "version": "5.15.216",
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                            "lessThanOrEqual": "*",
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                            "versionType": "original_commit_for_fix"
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                    ]
                }