[Bug 767501] curlsmtpsink: Lock and don't send final boundary upon error

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767501

--- Comment #1 from Sebastian Rasmussen <sebras at hotmail.com> ---
Created attachment 329580
  --> https://bugzilla.gnome.org/attachment.cgi?id=329580&action=edit
Proposed patch.

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