migration: clean up xbzrle cache init/destroy
Let's further simplify ram_init_all() and ram_save_cleanup() by abstract all the XBZRLE related codes into their own functions. When allocating xbzrle cache, we are always very careful on -ENOMEM; which makes sense. Replacing the last g_malloc0() with g_try_malloc0(), then refactor the logic a bit. This patch should be fixing some memory leaks when some memory allocation failed for XBZRLE in the past. Signed-off-by: NPeter Xu <peterx@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Signed-off-by: NJuan Quintela <quintela@redhat.com>
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