Presently we get procfs warnings from ipmi_si.ko due to its failing to
remove all of a /proc directory's contents prior to removing that
directory.

This patch tracks all proc entries for an IPMI interface and unregisters
them all upon removal.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>