msgb: add ->dst attribute to store routing information

This patch adds a new attribute to msgb objects. This new
attribute will store a pointer to the routing information,
in the case of the A-bis link, this will be used to store
e1inp_sign_link instead of struct gsm_bts_trx.

This deprecates msg->trx, that can be removed once all
application are ported to use msg->dst.
1 file changed