Add missing break in switch statement

Change-Id: I6206cc9ca46c4e2f125d3d820256280586ad66a1
diff --git a/libs/gui/SurfaceTexture.cpp b/libs/gui/SurfaceTexture.cpp
index ed6b73e..300b8d7 100644
--- a/libs/gui/SurfaceTexture.cpp
+++ b/libs/gui/SurfaceTexture.cpp
@@ -608,7 +608,7 @@
                     // We know there's no subsampling of any channels, so we
                     // only need to shrink by a half a pixel.
                     shrinkAmount = 0.5;
-
+                    break;
                 default:
                     // If we don't recognize the format, we must assume the
                     // worst case (that we care about), which is YUV420.