Fix #1146 + some coding style cleanups (orig PR #1156) #1160
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Fix #1146: ttls_update_checksum() can be called for chunk of ClientHello,
while we still don't know the cipher suite. So calculate two checksums
in parallel and copy SHA256 contex if necessary when ClientHello
sets xfrm.ciphersuite_info.
The rest of the patch, besides ttls_update_checksum() changes, is
coding style adjustments.
Comments still to fix:
#1156 (comment)
#1156 (comment)