amd8111_edac: Fix leaks in probe error paths

Both probe error paths are incomplete and leak memory and device
references. Add the missing cleanups.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Link: http://lkml.kernel.org/r/20140224154534.5a3b797a@endymion.delvare


Cc: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Borislav Petkov <bp@suse.de>