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Don't try to access an optional parameter if it is NULL
svn path=/trunk/; revision=19242
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@ -1236,7 +1236,7 @@ static LONG SETUP_CreateDevList(
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DWORD dwLength;
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DWORD rc;
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if (IsEqualIID(class, &GUID_NULL))
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if (class && IsEqualIID(class, &GUID_NULL))
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class = NULL;
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/* Open Enum key */
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