BaseTools/Ecc: GUID checkpoint
BaseTools/Ecc: GUID checkpoint

Fix a bug of checking duplicate GUID

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hess Chen <cd31d2c0b41e8a9f91ae5252b98c84bd235157fd@intel.com>
Reviewed-by: Yonghong Zhu <78d981fe33a016071af5222c56d5cf77f30fb0b2@intel.com>

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