fs/dlm/debug_fs.c: replace seq_printf by seq_puts

Replace seq_printf where possible.  This patch also fixes the following
checkpatch warning "unnecessary whitespace before a quoted newline"

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Cc: Christine Caulfield <ccaulfie@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>