VST3 Host: Tidy up input/output loops

modules/juce_audio_processors/format_types/juce_VST3PluginFormat.cpp

@@ -2761,9 +2761,8 @@ public:
 
         // not much we can do to check the layout while the audio processor is running
         // Let's at least check if it is a VST3 compatible layout
-        for (int dir = 0; dir < 2; ++dir)
+        for (const auto isInput : { true, false })
         {
-            bool isInput = (dir == 0);
             auto n = getBusCount (isInput);
 
             for (int i = 0; i < n; ++i)
@@ -2776,9 +2775,8 @@ public:
 
     bool syncBusLayouts (const BusesLayout& layouts) const
     {
-        for (int dir = 0; dir < 2; ++dir)
+        for (const auto isInput : { true, false })
         {
-            bool isInput = (dir == 0);
             auto n = getBusCount (isInput);
             const Vst::BusDirection vstDir = (isInput ? Vst::kInput : Vst::kOutput);
 
@@ -3437,9 +3435,8 @@ private:
         VSTComSmartPtr<Vst::IAudioProcessor> processor;
         processor.loadFrom (component.get());
 
-        for (int dirIdx = 0; dirIdx < 2; ++dirIdx)
+        for (const auto isInput : { true, false })
         {
-            const bool isInput = (dirIdx == 0);
             const Vst::BusDirection dir = (isInput ? Vst::kInput : Vst::kOutput);
             const int numBuses = component->getBusCount (Vst::kAudio, dir);