skiboot: Add default error handler for ipmi messages
skiboot: Add default error handler for ipmi messages

Most messages won't require their own error handler. This patch adds a
default handler to ensure we don't leak messages.

Signed-off-by: Alistair Popple <e9adbcf81c8a36ccc628e09bc92d0e25e1c8e501@popple.id.au>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

stewart-ibm/skiboot,qemu/skiboot,csmart/skiboot,open-power/skiboot,open-power/skiboot,qemu/skiboot,csmart/skiboot,csmart/skiboot,open-power/skiboot,shenki/skiboot,legoater/skiboot,open-power/skiboot,shenki/skiboot,mikey/skiboot,cyrilbur-ibm/skiboot,jk-ozlabs/skiboot,apopple/skiboot,ddstreet/skiboot,shenki/skiboot,cyrilbur-ibm/skiboot,neelegup/skiboot,apopple/skiboot,mikey/skiboot,neelegup/skiboot,legoater/skiboot,apopple/skiboot,qemu/skiboot,qemu/skiboot,shenki/skiboot,jk-ozlabs/skiboot,ddstreet/skiboot,jk-ozlabs/skiboot,stewart-ibm/skiboot,neelegup/skiboot,stewart-ibm/skiboot,legoater/skiboot,qemu/skiboot,cyrilbur-ibm/skiboot,mikey/skiboot,shenki/skiboot,legoater/skiboot,open-power/skiboot,legoater/skiboot,ddstreet/skiboot