Removes warnings generated by gcc and clang.



git-svn-id: http://skia.googlecode.com/svn/trunk@2651 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrAtlas.cpp b/src/gpu/GrAtlas.cpp
index 244f694..7b88498 100644
--- a/src/gpu/GrAtlas.cpp
+++ b/src/gpu/GrAtlas.cpp
@@ -174,7 +174,7 @@
             kNone_GrAALevel,
             GR_ATLAS_TEXTURE_WIDTH,
             GR_ATLAS_TEXTURE_HEIGHT,
-            maskformat2pixelconfig(format)
+            { maskformat2pixelconfig(format) }
         };
         fTexture[format] = fGpu->createTexture(desc, NULL, 0);
         if (NULL == fTexture[format]) {