Reconfiguring MPLS channel while down causes segfault on bird 3.2.0

Hello, I've found an issue with bird 3.2.0 which can be reproduced with the following configuration (no peer required). Just run configure after starting bird. router id 1; mpls table mtab; mpls domain mdom; protocol bgp test {   local 192.0.2.2 port 8179 as 65000;   neighbor 192.0.2.1 as 65001;   mpls {label policy aggregate;}; } It appears that this issue is caused because c->mpls_map is only set in mpls_channel_start instead of mpls_channel_init which would also match the deallocation in mpls_channel_cleanup. This means that before the channel is first up c->mpls_map is null and would cause a null pointer dereference as part of mpls_fec_map_reconfigure (called in mpls_channel_reconfigure).