fix release build vulkan

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1819853004

Review URL: https://codereview.chromium.org/1819853004
diff --git a/src/gpu/vk/GrVkGpu.cpp b/src/gpu/vk/GrVkGpu.cpp
index 0666f10..926e423 100644
--- a/src/gpu/vk/GrVkGpu.cpp
+++ b/src/gpu/vk/GrVkGpu.cpp
@@ -357,7 +357,7 @@
 
     // wait for all commands to finish
     fResourceProvider.checkCommandBuffers();
-    VkResult res = VK_CALL(QueueWaitIdle(fQueue));
+    SkDEBUGCODE(VkResult res =) VK_CALL(QueueWaitIdle(fQueue));
     // VK_ERROR_DEVICE_LOST is acceptable when tearing down (see 4.2.4 in spec)
     SkASSERT(VK_SUCCESS == res || VK_ERROR_DEVICE_LOST == res);
  
diff --git a/src/gpu/vk/GrVkProgram.cpp b/src/gpu/vk/GrVkProgram.cpp
index d9d4336..9580a3a 100644
--- a/src/gpu/vk/GrVkProgram.cpp
+++ b/src/gpu/vk/GrVkProgram.cpp
@@ -62,9 +62,7 @@
     fVertexUniformBuffer.reset(GrVkUniformBuffer::Create(gpu, vertexUniformSize, true));
     fFragmentUniformBuffer.reset(GrVkUniformBuffer::Create(gpu, fragmentUniformSize, true));
 
-#ifdef SK_DEBUG
     fNumSamplers = numSamplers;
-#endif
 }
 
 GrVkProgram::~GrVkProgram() {
diff --git a/src/gpu/vk/GrVkProgram.h b/src/gpu/vk/GrVkProgram.h
index 1a024f2..23a9713 100644
--- a/src/gpu/vk/GrVkProgram.h
+++ b/src/gpu/vk/GrVkProgram.h
@@ -182,9 +182,7 @@
     DescriptorPoolManager  fSamplerPoolManager;
     DescriptorPoolManager  fUniformPoolManager;
 
-#ifdef SK_DEBUG
     int fNumSamplers;
-#endif
 
     friend class GrVkProgramBuilder;
 };