Fix crash from asynchronous GPU metrics

Fixes: 241751056
Test: repo steps from bug
Change-Id: I3d1434bc4aa240863611d4f740815391d4067784
diff --git a/libs/hwui/FrameInfoVisualizer.cpp b/libs/hwui/FrameInfoVisualizer.cpp
index 3a8e559..687e4dd 100644
--- a/libs/hwui/FrameInfoVisualizer.cpp
+++ b/libs/hwui/FrameInfoVisualizer.cpp
@@ -179,7 +179,7 @@
 void FrameInfoVisualizer::nextBarSegment(FrameInfoIndex start, FrameInfoIndex end) {
     int fast_i = (mNumFastRects - 1) * 4;
     int janky_i = (mNumJankyRects - 1) * 4;
-    ;
+
     for (size_t fi = 0; fi < mFrameSource.size(); fi++) {
         if (mFrameSource[fi][FrameInfoIndex::Flags] & FrameInfoFlags::SkippedFrame) {
             continue;