Fixed the security hole (really, I'm a moron - used $failed > $threshold instead of $failed >= $threashold) and patched up some...erm... math issues
#!/bin/bash
for f in *.svg; do
echo Converting $f
fname=`echo $f | cut -d '.' -f 1`
rm -f $fname.png
inkscape -z -f $f -w 22 -h 22 -e ./$fname.png
done