bsc: remove flush from f_expect_chan_rel

When we're expecting release, it can be non-deterministic / timing dependent to
flush the RSL queue. Particularly the RR Release message is typically already
in the queue when f_expect_chan_rel() is called and would be lost.

It turns out that none of the current callers need the flush feature.

If a test needs it, we can add a separate f_rsl_flush() function and call that,
no need to clutter up the f_expect_chan_rel() argument list. I had such
function but found that no caller needs it, so dropped it.

Related: OS#3413
Change-Id: Ie1be30c3f109dda8c58c523df508211f8e20aad3
1 file changed