[PATCH] IPMI: convert from semaphores to mutexes

Convert the remaining semaphores to mutexes in the IPMI driver.  The
watchdog was using a semaphore as a real semaphore (for IPC), so the
conversion there required adding a completion.

Signed-off-by: Corey Minyard <minyard@acm.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>