sipsess/reply: fix heap-use-after-free bug #1179
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fixes #1178 - `mem_deref(sess)` calls list_flush(&sess->replyl) within destructor and reply is a dangling pointer after this.
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fixes #1178 -
mem_deref(sess)calls maybelist_flush(&sess->replyl)within destructor and reply is a dangling pointer after this.