vtls: optimize the error handling in ssl_cf_connect() #19196
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In lib/vtls/vtls.c:ssl_cf_connect(), an error path do not properly restore the cfilter.
This PR unifies its error handling.
By the way, as checking preferences is more lightweight than initing a peer, this PR also optimize the execution order: Check prefs at first to avoid unnecessary initialization for a peer when ssl_prefs_check fails.