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minor fix in SetupDiGetDeviceInstanceIdA
svn path=/trunk/; revision=19623
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@ -3493,7 +3493,7 @@ BOOL WINAPI SetupDiGetDeviceInstanceIdA(
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DeviceInstanceIdW, DeviceInstanceIdSize,
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RequiredSize);
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if (DeviceInstanceIdW != NULL)
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if (ret && DeviceInstanceIdW != NULL)
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{
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if (WideCharToMultiByte(CP_ACP, 0, DeviceInstanceIdW, -1,
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DeviceInstanceId, DeviceInstanceIdSize, NULL, NULL) == 0)
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