dpaa2-switch: fix the error path in dpaa2_switch_rx()

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                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                        "drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c"
                    ],
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