Please test bug #34893

[Jordi Gutiérrez Hermoso]

Hi, I have pushed a fix for the fairly severe bug in conv2 that breaks
a lot of image processing (well, severe for me, because I care about
image processing):

    https://savannah.gnu.org/bugs/?34893

Please test the stable branch and let me know if it really is fixed,
particularly with functions from the image package which were breaking
due to this bug (e.g. fftconv2).

Thanks,
- Jordi G. H.