As reported by:

FILES=`find -name "*.[hc]" -o -name "*.js" | grep -v -- '-introspection.c'`

for F in $FILES ; do
    COUNT=`egrep '[ ]+$' $F | wc -l`
    if test x"$COUNT" != x0 ; then
        echo "$F: $COUNT trailing spaces"
    fi
    COUNT=`grep '       ' $F | wc -l`
    if test x"$COUNT" != x0 ; then
        echo "$F: $COUNT tabs"
    fi
done