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The ci_req->hw_buf can be NULL, test whether it is and if so, avoid accessing it. Else, the system may crash. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Peter Chen <peter.chen@nxp.com> Cc: Li Jun <jun.li@nxp.com> Cc: Peng Fan <peng.fan@nxp.com>