build: fix warning

alalek · alalek · commit 5c0a287ce84b · 2017-06-08T20:40:36.000+03:00
C4189: 'clImageUV' : local variable is initialized but not referenced
diff --git a/modules/core/src/directx.cpp b/modules/core/src/directx.cpp
@@ -794,7 +794,9 @@ void convertToD3D11Texture2D(InputArray src, ID3D11Texture2D* pD3D11Texture2D)
 
     cl_int status = 0;
     cl_mem clImage = 0;
+#ifdef HAVE_DIRECTX_NV12
     cl_mem clImageUV = 0;
+#endif
 
     clImage = clCreateFromD3D11Texture2DKHR(context, CL_MEM_WRITE_ONLY, pD3D11Texture2D, 0, &status);
     if (status != CL_SUCCESS)
