busybox-1.19.3/scripts/find_stray_empty_lines

#!/bin/sh

grep -n -B1 -r $'^\t*}$' . | grep -A1 '.[ch]-[0-9]*-$'
grep -n -A1 -r $'^\t*{$' . | grep -B1 '.[ch]-[0-9]*-$'
# or (less surefire ones):
grep -n -B1 -r $'^\t*}' . | grep -A1 '.[ch]-[0-9]*-$'
grep -n -A1 -r $'^\t*{' . | grep -B1 '.[ch]-[0-9]*-$'

# find trailing empty lines
find -type f | while read file; do
        test x"$file" = x"" && continue
        tail -n1 $file | while read lastline
        do
          #echo "|$file|$lastline"
          if test x"$lastline" = x""; then
                echo "$file"
          fi
        done
done