Dongao Guo 6d665168b0 MdeModulePkg/RegularExpressionDxe: Add null pointer check
This is the part of commit 3948c510edad901bb9f8d23f7bf0f4ae91b5fcde.

Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Dongao Guo <dongao.guo@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
2018-10-16 15:24:23 +08:00
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