net/smc: check smcd_v2_ext_offset when receiving proposal msg

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                    "product": "Linux",
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                    "programFiles": [
                        "net/smc/af_smc.c",
                        "net/smc/smc_clc.h"
                    ],
                    "versions": [
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                            "versionType": "original_commit_for_fix"
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