ipmi: Remove a FIXME for slab conversion

There can't be more than a few IPMI messages allocated at any one time,
so converting the messages to slabs would be a waste.  So just remove
the FIXME.

Suggested-by: Nicholas Krause <xerofoify@gmail.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>

drivers/char/ipmi/ipmi_msghandler.c

@@ -4212,7 +4212,6 @@ static void need_waiter(ipmi_smi_t intf)
 static atomic_t smi_msg_inuse_count = ATOMIC_INIT(0);
 static atomic_t recv_msg_inuse_count = ATOMIC_INIT(0);
 
-/* FIXME - convert these to slabs. */
 static void free_smi_msg(struct ipmi_smi_msg *msg)
 {
 	atomic_dec(&smi_msg_inuse_count);