Qiu Shumin 6d3911d406 ShellPkg: Add NULL pointer check.
Add pointer check to avoid NULL pointer dereferenced.

Cc: Jaben Carsey <jaben.carsey@intel.com>
Cc: Tapan Shah <tapandshah@hpe.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qiu Shumin <shumin.qiu@intel.com>
Reviewed-by: Tapan Shah <tapandshah@hpe.com>
2016-04-29 13:23:19 +08:00
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