net: stmmac: Prevent NULL deref when RX memory exhausted

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{
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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                        "drivers/net/ethernet/stmicro/stmmac/stmmac_main.c"
                    ],
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                            "versionType": "original_commit_for_fix"
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                }