luozhengzheng 70df4c21c0 Fix coverity defects: 154021
CID 154021: Null pointer dereference

Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: luozhengzheng <luo.zhengzheng@zte.com.cn>
Closes #5380
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