comment out verbose log line

src/renderer/painter_text.cpp

@@ -78,7 +78,7 @@ void Painter::renderText(TextBucket& bucket, std::shared_ptr<StyleLayer> layer_d
     float fadedist = zoomDiff / (timeDiff / duration);
 
 #if defined(DEBUG)
-    if (std::isnan(fadedist)) fprintf(stderr, "fadedist should never be NaN\n");
+//    if (std::isnan(fadedist)) fprintf(stderr, "fadedist should never be NaN\n");
 #endif
 
     // At end of a zoom when the zoom stops changing continue pretending to zoom at that speed