Strange redefine numBytesRendered in DSoundStream

[GermanAizek]

@hrydgard,
why is there redefinition numBytesRendered in this section code?
Is it intentional to call callback with parameter?

ppsspp/Windows/DSoundStream.cpp

Lines 124 to 131 in 744678b

	int numBytesToRender = RoundDown128(ModBufferSize(currentPos_ - lastPos_));
	if (numBytesToRender >= 256) {
	int numBytesRendered = 4 * (*callback_)(realtimeBuffer_, numBytesToRender >> 2, 44100);
	//We need to copy the full buffer, regardless of what the mixer claims to have filled
	//If we don't do this then the sound will loop if the sound stops and the mixer writes only zeroes
	numBytesRendered = numBytesToRender;
	WriteDataToBuffer(lastPos_, (char *) realtimeBuffer_, numBytesRendered);

[hrydgard]

That looks weird indeed. this is ancient code (10+ years old) so I don't remember if there was a reason. will look into it.

[anr2me]

It came from this PR #4447
May be it's mistakenly swapped between numBytesRendered and numBytesToRender ...