Minor refactor of GrLayerHoister

tests/GpuLayerCacheTest.cpp

Index: tests/GpuLayerCacheTest.cpp
diff --git a/tests/GpuLayerCacheTest.cpp b/tests/GpuLayerCacheTest.cpp
index 2249eba904c7dda92955bd1509a80afd53c2450f..eea81db38586162925e0d13a047eca9a45688198 100644
--- a/tests/GpuLayerCacheTest.cpp
+++ b/tests/GpuLayerCacheTest.cpp
@@ -69,8 +69,8 @@ static void create_layers(skiatest::Reporter* reporter,
         REPORTER_ASSERT(reporter, picture.uniqueID() == layer->pictureID());
         REPORTER_ASSERT(reporter, layer->start() == idOffset + i + 1);
         REPORTER_ASSERT(reporter, layer->stop() == idOffset + i + 2);
-        REPORTER_ASSERT(reporter, nullptr == layer->texture());
-        REPORTER_ASSERT(reporter, nullptr == layer->paint());
+        REPORTER_ASSERT(reporter, !layer->texture());
+        REPORTER_ASSERT(reporter, !layer->paint());
         REPORTER_ASSERT(reporter, !layer->isAtlased());
     }
 }
@@ -197,7 +197,7 @@ DEF_GPUTEST_FOR_RENDERING_CONTEXTS(GpuLayerCache, reporter, ctxInfo) {
         } else {
 #endif
             // The final layer should not be atlased.
-            REPORTER_ASSERT(reporter, nullptr == layer->texture());
+            REPORTER_ASSERT(reporter, !layer->texture());
             REPORTER_ASSERT(reporter, !layer->isAtlased());
 #if GR_CACHE_HOISTED_LAYERS
         }
@@ -258,7 +258,7 @@ DEF_GPUTEST_FOR_RENDERING_CONTEXTS(GpuLayerCache, reporter, ctxInfo) {
             // The one that was never atlased should still be around
             REPORTER_ASSERT(reporter, layer);
 
-            REPORTER_ASSERT(reporter, nullptr == layer->texture());
+            REPORTER_ASSERT(reporter, !layer->texture());
             REPORTER_ASSERT(reporter, !layer->isAtlased());
 #if GR_CACHE_HOISTED_LAYERS
         } else {