CLEANUP: stconn: make a few functions take a const argument

A number of functions in cs_utils.h are not usable from functions taking
a const because they're not declared as using const, despite never
modifying the stconn. Let's address this for the following ones:

  sc_ic(), sc_oc(), sc_ib(), sc_ob(), sc_strm_task(),
  cs_opposite(), sc_conn_ready(), cs_src(), cs_dst(),
1 file changed