luozhengzheng 32dec7bd1a Fix coverity defects: CID 147503
CID 147503: Dereference after null check (FORWARD_NULL)

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: luozhengzheng <luo.zhengzheng@zte.com.cn>
Closes 
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..
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