Fix audio voice release leak

Author: M3RCU3Y

src/SoundType.Audio/ActiveVoiceSampleProvider.cs

@@ -23,7 +23,7 @@ public int Read(float[] buffer, int offset, int count)
         try
         {
             int read = _source.Read(buffer, offset, count);
-            if (read == 0)
+            if (read == 0 || (count > 0 && read < count))
             {
                 Release();
             }

src/SoundType.Tests/BackendPerformanceTests.cs

@@ -106,6 +106,19 @@ public void ActiveVoiceSampleProvider_ReleasesLeaseWhenSourceFinishes()
         Assert.Equal(0, limiter.ActiveVoices);
     }
 
+    [Fact]
+    public void ActiveVoiceSampleProvider_ReleasesLeaseOnFinalPartialRead()
+    {
+        VoiceLimiter limiter = new(maxVoices: 1);
+        Assert.True(limiter.TryAcquire(out IDisposable lease));
+        ActiveVoiceSampleProvider provider = new(new ArraySampleProvider([0.25f]), lease);
+        float[] buffer = new float[2];
+
+        Assert.Equal(1, provider.Read(buffer, 0, buffer.Length));
+
+        Assert.Equal(0, limiter.ActiveVoices);
+    }
+
     [Fact]
     public void WaveformPeakCache_ReusesPeaksForSameLoadedSample()
     {