Fix createBuffer in Vulkan

src/gpu/vk/GrVkGpu.cpp

Index: src/gpu/vk/GrVkGpu.cpp
diff --git a/src/gpu/vk/GrVkGpu.cpp b/src/gpu/vk/GrVkGpu.cpp
index b23cced41d81a2016e748ae37f5b49295f52580c..5fba475cab34c4bb3a942bd77b7296d6cc013a60 100644
--- a/src/gpu/vk/GrVkGpu.cpp
+++ b/src/gpu/vk/GrVkGpu.cpp
@@ -180,16 +180,20 @@ GrBuffer* GrVkGpu::onCreateBuffer(size_t size, GrBufferType type, GrAccessPatter
             SkASSERT(kDynamic_GrAccessPattern == accessPattern ||
                      kStatic_GrAccessPattern == accessPattern);
             buff = GrVkVertexBuffer::Create(this, size, kDynamic_GrAccessPattern == accessPattern);
+            break;
         case kIndex_GrBufferType:
             SkASSERT(kDynamic_GrAccessPattern == accessPattern ||
                      kStatic_GrAccessPattern == accessPattern);
             buff = GrVkIndexBuffer::Create(this, size, kDynamic_GrAccessPattern == accessPattern);
+            break;
         case kXferCpuToGpu_GrBufferType:
             SkASSERT(kStream_GrAccessPattern == accessPattern);
             buff = GrVkTransferBuffer::Create(this, size, GrVkBuffer::kCopyRead_Type);
+            break;
         case kXferGpuToCpu_GrBufferType:
             SkASSERT(kStream_GrAccessPattern == accessPattern);
             buff = GrVkTransferBuffer::Create(this, size, GrVkBuffer::kCopyWrite_Type);
+            break;
         default:
             SkFAIL("Unknown buffer type.");
             return nullptr;