0.4.3 segfault

Not sure what triggered this segfault.

Sorry the wireplumber i was running doesn't have debug symbols, here's the partial stack trace:

#0  0x00007f0f22d2151f in wp_spa_pod_builder_add_pod () at /usr/lib/libwireplumber-0.4.so.0
#1  0x00007f0f20133b36 in  () at /usr/lib/wireplumber-0.4/libwireplumber-module-si-audio-adapter.so
#2  0x00007f0f2013525a in  () at /usr/lib/wireplumber-0.4/libwireplumber-module-si-audio-adapter.so
#3  0x00007f0f20150925 in  () at /usr/lib/wireplumber-0.4/libwireplumber-module-si-standard-link.so
#4  0x00007f0f20150f32 in  () at /usr/lib/wireplumber-0.4/libwireplumber-module-si-standard-link.so
#5  0x00007f0f2015120a in  () at /usr/lib/wireplumber-0.4/libwireplumber-module-si-standard-link.so
#6  0x00007f0f22d29e65 in wp_transition_advance () at /usr/lib/libwireplumber-0.4.so.0
#7  0x00007f0f22d180a0 in  () at /usr/lib/libwireplumber-0.4.so.0
#8  0x00007f0f22bb13e5 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#9  0x00007f0f22c05749 in  () at /usr/lib/libglib-2.0.so.0
#10 0x00007f0f22bb0a63 in g_main_loop_run () at /usr/lib/libglib-2.0.so.0
#11 0x000056410b69a1db in  ()
#12 0x00007f0f228deb25 in __libc_start_main () at /usr/lib/libc.so.6
#13 0x000056410b69a30e in  ()

I will run a build with debug symbols and see if this happens again