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Remove direct calls to printf from the tls_check_hostname() path. This allows
NUL byte error messages to bubble up to the caller, to be logged in a
program-appropriate way. It also removes non-portable calls to getprogname().
The semantics of tls_error() are changed slightly: the last error message is
not necessarily preserved between subsequent calls into the library.
When the previous call to libtls succeeds, client programs should treat the
return value of tls_error() as undefined.
ok tedu@
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