[PATCH] bonding: Format fix in seq_printf call

Though link_failure_count is type unsigned int, this value is outputted to
/proc/net/bonding/bondX file using "%d" instead of "%u".

The attached patch fixes this problem.

Signed-off-by: Kenzo Iwami <k-iwami@cj.jp.nec.com>
Acked-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>