Fix Undefined value access
Fix Undefined value access

VariantClear(VARIANTARG *prop) called with undefined value, and pointer being freed was not allocated.

OlehKulykov/LzmaSDKObjC,OlehKulykov/LzmaSDK-ObjC,OlehKulykov/LzmaSDKObjC,OlehKulykov/LzmaSDK-ObjC,OlehKulykov/LzmaSDK-ObjC,OlehKulykov/LzmaSDK-ObjC,OlehKulykov/LzmaSDKObjC