Fix GetLatencies() not working on streams

This fixes a regression introduced by a typo in
59f75ce.

The reason why that obviously wrong code compiled is because of a type
safety trainwreck: PaStream* is an alias of void*, which can be
implicitly converted from anything, and we accidentally passed a
PaStream** instead of a PaStream*. Oops.

Fixes #231

src/flexasio/FlexASIO/flexasio.cpp

@@ -823,7 +823,7 @@ namespace flexasio {
 
 	long FlexASIO::ComputeLatencyFromStream(PaStream* stream, bool output, size_t bufferSizeInFrames) const
 	{
-		const PaStreamInfo* stream_info = Pa_GetStreamInfo(&stream);
+		const PaStreamInfo* stream_info = Pa_GetStreamInfo(stream);
 		if (!stream_info) throw ASIOException(ASE_HWMalfunction, "unable to get stream info");
 
 		// See https://github.com/dechamps/FlexASIO/issues/10.