SF: Fix -Wunused-but-set-variable

Soong appends -Wno-error=unused-but-set-variable, negating SF's -Werror.

- The type and appId variables are VR remnants.
- TimeStats::canAddNewAggregatedStats compared apples and oranges.

Bug: 129481165
Test: No warnings on clean build
Change-Id: I071e71148a269bf9ab9a5e930a775b4ae6564916
diff --git a/services/surfaceflinger/BufferLayerConsumer.cpp b/services/surfaceflinger/BufferLayerConsumer.cpp
index 96b2247..c79fa11 100644
--- a/services/surfaceflinger/BufferLayerConsumer.cpp
+++ b/services/surfaceflinger/BufferLayerConsumer.cpp
@@ -438,7 +438,7 @@
 }
 
 void BufferLayerConsumer::onSidebandStreamChanged() {
-    FrameAvailableListener* unsafeFrameAvailableListener = nullptr;
+    [[maybe_unused]] FrameAvailableListener* unsafeFrameAvailableListener = nullptr;
     {
         Mutex::Autolock lock(mFrameAvailableMutex);
         unsafeFrameAvailableListener = mFrameAvailableListener.unsafe_get();