Check whether font creation is failed to avoid segment fault.

tests/FontHostStreamTest.cpp

Index: tests/FontHostStreamTest.cpp
diff --git a/tests/FontHostStreamTest.cpp b/tests/FontHostStreamTest.cpp
index 4fd88cc4da9a3ee57d6a07e62da9d665971b5975..30e469b4105b71857214e5dfc59620420b76027f 100644
--- a/tests/FontHostStreamTest.cpp
+++ b/tests/FontHostStreamTest.cpp
@@ -72,7 +72,9 @@ static void test_fontHostStream(skiatest::Reporter* reporter) {
         paint.setColor(SK_ColorGRAY);
         paint.setTextSize(SkIntToScalar(30));
 
-        paint.setTypeface(SkTypeface::CreateFromName("Georgia", SkTypeface::kNormal))->unref();
+        SkTypeface* fTypeface = SkTypeface::CreateFromName("Georgia",
+                                                           SkTypeface::kNormal);
+        SkSafeUnref(paint.setTypeface(fTypeface));
 
         SkIRect origRect = SkIRect::MakeWH(64, 64);
         SkBitmap origBitmap;