Fix bug 8040 - smbclient segfaults when a Cyrillic netbios name or workgroup is configured.

As discovered by David Disseldorp <ddiss@suse.de>, convert_string_talloc()
doesn't always return consistent results for a zero length string. The
API states an incoming string must *always* contain the terminating null,
but unfotunately too much code expects passing in a zero source length
to return a null terminated string, so at least ensure we return a
correct null string in the required character set and return the
correct length.

Also ensure we cannot return a zero length for a converted string
(we ensure that the returned buffer is always allocated and zero
terminated anyway) as calling code depends on the fact that returning
true from this function will *always* return a non-zero length (as
it must include the terminating null).

Jeremy.

Autobuild-User: Jeremy Allison <jra@samba.org>
Autobuild-Date: Fri Mar 25 23:25:40 CET 2011 on sn-devel-104

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