Error in Xobjdetect (Bug #4245)

In acffeature.cpp, the "void ACFFeatureEvaluatorImpl::setChannels(InputArrayOfArrays channels)" function will often overrun the right or bottom channel Mat. The code needs to be changed to something like:

for( int cell_row = row; cell_row < row + 4; ++cell_row )
for( int cell_col = col; cell_col < col + 4; ++cell_col ) {
if( cell_col < channel.cols && cell_row < channel.rows ) <--- Add this
sum += (int)channel.at<float>(cell_row, cell_col);
}

if( col / 4 < acf_channel.cols && row / 4 < acf_channel.rows )     <---  Add this
    acf_channel(row / 4, col / 4) = sum;