fixed compile error when HAVE_CUDA is not defined

modules/gpu/src/imgproc_gpu.cpp

@@ -53,8 +53,8 @@ void cv::gpu::drawColorDisp(const GpuMat&, GpuMat&, int) { throw_nogpu(); }
 void cv::gpu::drawColorDisp(const GpuMat&, GpuMat&, int, const Stream&) { throw_nogpu(); }
 void cv::gpu::reprojectImageTo3D_GPU(const GpuMat&, GpuMat&, const Mat&) { throw_nogpu(); }
 void cv::gpu::reprojectImageTo3D_GPU(const GpuMat&, GpuMat&, const Mat&, const Stream&) { throw_nogpu(); }
-void cvtColor_GPU(const GpuMat& GpuMat&, int, int) { throw_nogpu(); }
-void cvtColor_GPU(const GpuMat& GpuMat&, int, int, const Stream&) { throw_nogpu(); }
+void cvtColor_GPU(const GpuMat&, GpuMat&, int, int) { throw_nogpu(); }
+void cvtColor_GPU(const GpuMat&, GpuMat&, int, int, const Stream&) { throw_nogpu(); }
 
 #else /* !defined (HAVE_CUDA) */
 
@@ -526,4 +526,4 @@ void cv::gpu::cvtColor_GPU(const GpuMat& src, GpuMat& dst, int code, int dcn, co
     cvtColor_caller(src, dst, code, dcn, StreamAccessor::getStream(stream));
 }
 
-#endif /* !defined (HAVE_CUDA) */
+#endif /* !defined (HAVE_CUDA) */