software: typo in ashs chunk script

software/ashs.rst

@@ -90,7 +90,7 @@ position.  Subsequent runs of this script will submit chunksize number of new
             exit 0
         fi
 
-        name=${subject%%\.img}
+        name=${subject%%\.nii}
         wdir=workdir_${name}_dir
         if [ -d $wdir ] ; then
             echo "Skipping $subject, working directory exists."