fix: apply rename of osmo_sua_link_get_user_priv()

In the course of a rebase in libosmo-sccp, osmo_sua_link_get_user_priv() was
renamed to osmo_sccp_link_get_user_priv(). Apply this rename here to fix the
build.

Change-Id: I09603f5eb983f17c1e4a1232967fc43c7ceea12a
1 file changed