(ITS#6760) rwm broken entry handling

Full_Name: Hallvard B Furuseth Version: 2.4.23, HEAD OS: URL: Submission from: (NULL) (129.240.6.233) Submitted by: hallvard

rwm_entry_get_rw() returns failure with an entry in *ep if rwm_send_entry() fails.

rwm_send_entry() does not honor REP_ENTRY_MUSTBEFREED. And its ITS#6423 bugcatch can be done before entry_dup().

Fixing - I think - but my fix could use some extra eyes.

In particuar, am I right about using be_entry_release_r() or should it have used overlay_entry_release_ov() which rs_replace_entry() uses? Or should rwm_send_entry() use different release methods depending on whether it is called by rwm.on_response or rwm.on_bi.bi_entry_get_rw?