add osmo_pfcp_ip_addrs_to_str_*()

Move static function ip_addrs_to_str_buf() to public API as
osmo_pfcp_ip_addrs_to_str_buf() and osmo_pfcp_ip_addrs_to_str_c().

So far the static function was only used in places where it follows
other strings, so that it made sense to always start with a comma. Move
this comma out of the function to the callers.

Sensibly handle a NULL pointer and an empty address set.

Rationale: osmo-upf would like to print an osmo_pfcp_ip_addrs struct in
logging.

Change-Id: I5f67db8d347690cbb1ce273a2d072636859f1bf6

0 files changed, 0 insertions, 0 deletions