ipmi: fix return from atca_oem_poweroff_hook

A void returning function returned the return value of another void
returning function...

Spotted by sparse.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/char/ipmi/ipmi_poweroff.c

@@ -308,7 +308,7 @@ static void ipmi_poweroff_atca(ipmi_user_t user)
 	}
 
 	if (atca_oem_poweroff_hook)
-		return atca_oem_poweroff_hook(user);
+		atca_oem_poweroff_hook(user);
  out:
 	return;
 }