* avoids some divisions by zero

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@31765 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/apps/soundrecorder/ScopeView.cpp

@@ -120,6 +120,8 @@ void
 ScopeView::ComputeRendering()
 {
 	int64 framesCount = fMediaTrack->CountFrames() / SAMPLES_COUNT;
+	if (framesCount <= 0)
+		return;
 	T samples[fPlayFormat.u.raw_audio.buffer_size / (fPlayFormat.u.raw_audio.format 
 		& media_raw_audio_format::B_AUDIO_SIZE_MASK)];
 	int64 frames = 0;
@@ -160,6 +162,8 @@ ScopeView::ComputeRendering()
 		}
 	}
 	
+	if (previewMax <= 0)
+		return;
 	for (int i = 0; i < SAMPLES_COUNT; i++)
 		fPreview[i] = (int32)(fPreview[i] * 1.0 / previewMax * middle + middle);
 }