Append '\n' character to nanobench error message

bench/ETCBitmapBench.cpp

Index: bench/ETCBitmapBench.cpp
diff --git a/bench/ETCBitmapBench.cpp b/bench/ETCBitmapBench.cpp
index fe6fe06057ec1d1ea0ba87bb0796ad31b7b2da56..1b06112996269e4cf52b8bffd7e615e8c9a4f026 100644
--- a/bench/ETCBitmapBench.cpp
+++ b/bench/ETCBitmapBench.cpp
@@ -81,7 +81,7 @@ class ETCBitmapBenchBase : public Benchmark {
 public:
     ETCBitmapBenchBase() : fPKMData(loadPKM()) {
         if (nullptr == fPKMData) {
-            SkDebugf("Could not load PKM data!");
+            SkDebugf("Could not load PKM data!\n");
         }
     }