Switch to legacy method late in tls13_use_legacy_stack()

If memory allocation of s->init_buf fails in ssl3_setup_init_buffer()
during downgrade to the legacy stack, the legacy state machine would
resume with an incorrectly set up SSL, resulting in a NULL dereference.
The fix is to switch to the legacy method only after the SSL is fully
set up. There is a second part to this fix, which will be committed
once we manage to agree on the color of the bikeshed.

Detailed analysis and patch from Masaru Masuda, many thanks!
https://github.com/libressl/openbsd/issues/146

ok jsing

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