drivers/char/ipmi/ipmi_si_intf.c:default_find_bmc(): fix leak

If check_legacy_ioport() returns true, we leak *info.

Addresses http://bugzilla.kernel.org/show_bug.cgi?id=11362

Reported-by: Daniel Marjamki <danielm77@spray.se>
Cc: Christian Krafft <krafft@de.ibm.com>
Cc: Michael Ellerman <michael@ellerman.id.au>
Cc: Corey Minyard <minyard@acm.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>