platform/mihawk: Fix IPMI double-free
platform/mihawk: Fix IPMI double-free

The commit 6826095 ("platform/mihawk: support dynamic PCIe slot table")
added the IPMI OEM command to communicate with BMC. We do the
ipmi_free_msg(msg) twice that caused the Fast-reboot fail.

This patch fixes it by removing the IPMI double-free bug to restore
Fast-reboot.

Signed-off-by: Nichole Wang <03f89e03f5c01514fc0233bc208dfa1db232c11c@wistron.com>
Cc: 74fabe089ecbd0f3f71683991d9e2780a4de1f4a@lists.ozlabs.org # skiboot-6.6.x
Cc: 74fabe089ecbd0f3f71683991d9e2780a4de1f4a@lists.ozlabs.org # skiboot-op940.x
Fixes: commit 6826095 ("platform/mihawk: support dynamic PCIe slot table")
Reviewed-by: Vasant Hegde <a6d753843573f7bfed5075c1e875b0be8007a0ab@linux.vnet.ibm.com>
Signed-off-by: Oliver O'Halloran <3dfaff8fa6ae977f042064a112a6aac576279b9b@gmail.com>

legoater/skiboot,open-power/skiboot,shenki/skiboot,open-power/skiboot,qemu/skiboot,open-power/skiboot,qemu/skiboot,shenki/skiboot,qemu/skiboot,shenki/skiboot,legoater/skiboot,legoater/skiboot,open-power/skiboot,qemu/skiboot,shenki/skiboot,shenki/skiboot,open-power/skiboot,legoater/skiboot,legoater/skiboot,qemu/skiboot