Fix BufferQueue verbose log

Change-Id: Id80742b5c1fd2960cc2eda3a9ba2db1078df5320
diff --git a/libs/gui/BufferQueue.cpp b/libs/gui/BufferQueue.cpp
index c851e86..a6403d4 100644
--- a/libs/gui/BufferQueue.cpp
+++ b/libs/gui/BufferQueue.cpp
@@ -533,8 +533,12 @@
     ATRACE_CALL();
     ATRACE_BUFFER_INDEX(buf);
 
-    ST_LOGV("queueBuffer: slot=%d time=%lld crop=[%d,%d,%d,%d]", buf, timestamp,
-        crop.left, crop.top, crop.right, crop.bottom);
+    ST_LOGV("queueBuffer: slot=%d time=%lld crop=[%d,%d,%d,%d]", buf,
+            mSlots[buf].mTimestamp,
+            mSlots[buf].mCrop.left,
+            mSlots[buf].mCrop.top,
+            mSlots[buf].mCrop.right,
+            mSlots[buf].mCrop.bottom);
 
     sp<ConsumerListener> listener;