'%pF' and '%pf' are deprecated vsprintf pointer extensions, this patch
replace them by '%pS', which is suggested by checkpatch.pl.
Signed-off-by: NColy Li <colyli@suse.de>
Reviewed-by: NShenghui Wang <shhuiw@foxmail.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>