UI: Fix pixels[] size in AudioVisualizer

Buggy address found by ASAN

src/UI/DocumentViews/AudioVisualizer.cc

@@ -23,7 +23,8 @@ AudioVisualizer::AudioVisualizer(AudioContext::StreamPtr stream, VivyDocumentVie
     const size_t height   = audioStream->getDecodedChunkSize();
     const size_t decalage = audioStream->getDecodedDecalage();
     const size_t width    = (size - height) / decalage;
-    uchar *pixels         = new uchar[static_cast<size_t>(width * height / 2)]();
+    uchar *pixels =
+        new uchar[static_cast<size_t>(width * height / 2 + (size - height) / decalage)]();
 
     FFTSamplePtr chunkData(
         reinterpret_cast<FFTSample *>(av_malloc_array(2 * height, sizeof(FFTSample))),