invalid result of GPU bitwise_and with mask (Bug #4315)

Assume file "mask.png" contains a B&W mask (only 0 and 255 values).
If one performs cv::gpu::bitwise_and without a mask, everything works as expected:

using namespace cv;

gpu::GpuMat image(imread("image.png"));
gpu::GpuMat mask_3c(imread("mask.png"));
gpu::bitwise_and(image, mask_3c, image);
// produces: image &= mask_3c

However, performing cv::gpu::bitwise_and with a mask gives invalid results:

using namespace cv;

gpu::GpuMat image(imread("image.png"));
gpu::GpuMat mask_1c((imread("mask.png", CV_LOAD_IMAGE_GRAYSCALE) < 255));
gpu::GpuMat zero(image.rows, image.cols, CV_8UC3);
gpu::bitwise_and(image, zero, image, mask_1c);
// produces: image = zero, as if the mask was ignored