make bsc_clear_request() static

bsc_clear_request() is in fact used only within gsm_08_08.c, make it static to
that file.

Since the gscon FSM, "real" BSSMAP Clear are sent only by gscon_bssmap_clear().

bsc_clear_request() remains in use for legacy code paths in gsm_08_08.c:
- the bsc_filter, i.e. for IMSI filtering;
- in move_to_msc(), from handle_cc_setup(), a code path that is in fact not
  entirely clear to me. It seems to be an old functionality to serve multiple
  MSCs?

Both of which I personally haven't seen in use, are not tested and should
probably be completely removed.

For now contain legacy code in the static context.

Adjust comment.

Change-Id: Ic89d0afad42e4b11183a13d2dc6b7bbf0b822fd9
4 files changed