From 4fdf488960d8cf93ecf07de012b0addde2c799c7 Mon Sep 17 00:00:00 2001
From: "alexey.lysiuk" <alexey.lysiuk@gmail.com>
Date: Mon, 26 Feb 2018 13:22:36 +0200
Subject: [PATCH] Fixed MSVC compilation warning

VC\include\type_traits(1468): warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning)
src\sound\musicformats\music_midistream.cpp(832): note: see reference to function template instantiation 'std::function<bool (int)>::function<MIDIStreamer::SetMIDISource::<lambda_...>,int,void>(_Fx)' being compiled
---
 src/sound/musicformats/music_midistream.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/sound/musicformats/music_midistream.cpp b/src/sound/musicformats/music_midistream.cpp
index 207ea51a05..989dc6af79 100644
--- a/src/sound/musicformats/music_midistream.cpp
+++ b/src/sound/musicformats/music_midistream.cpp
@@ -829,7 +829,7 @@ uint32_t *MIDIStreamer::WriteStopNotes(uint32_t *events)
 void MIDIStreamer::SetMIDISource(MIDISource *_source)
 {
 	source = _source;
-	source->setTempoCallback([=](int tempo) { return MIDI->SetTempo(tempo); } );
+	source->setTempoCallback([=](int tempo) { return !!MIDI->SetTempo(tempo); } );
 }