Fix vulkan build on linux and android

tools/vulkan/android/VulkanTestContext_android.cpp

Index: tools/vulkan/android/VulkanTestContext_android.cpp
diff --git a/tools/vulkan/android/VulkanTestContext_android.cpp b/tools/vulkan/android/VulkanTestContext_android.cpp
index ea6b4288c02d1d19aea6737d79887e5a4d6ee607..58dbcb2843d84b590c4b68389de6e776cbe2c9c5 100644
--- a/tools/vulkan/android/VulkanTestContext_android.cpp
+++ b/tools/vulkan/android/VulkanTestContext_android.cpp
@@ -32,7 +32,7 @@ VkSurfaceKHR VulkanTestContext::createVkSurface(VkInstance instance, void* platf
     surfaceCreateInfo.flags = 0;
     surfaceCreateInfo.window = androidPlatformData->fNativeWindow;
 
-    VkResult res = createAndroidSurfaceKHR(fBackendContext->fInstance, &surfaceCreateInfo,
+    VkResult res = createAndroidSurfaceKHR(instance, &surfaceCreateInfo,
                                            nullptr, &surface);
     return (VK_SUCCESS == res) ? surface : VK_NULL_HANDLE;
 }