Tianhua Sun 493ddefd47 dm: fix pointer not checked for null before use ...

this patch fix null pointer access issues.

Tracked-On: #3434
Signed-off-by: Tianhua Sun <tianhuax.s.sun@intel.com>
Reviewed-by: Xiaoguang Wu <xiaoguang.wu@intel.com>

2019-07-30 16:36:13 +08:00

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