stream: Fix leaked joined_bin
There is no need to keep a strong ref on it, and _leave_bin() was setting it to NULL before calling g_clear_object() so it was leaked. https://bugzilla.gnome.org/show_bug.cgi?id=766612
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There is no need to keep a strong ref on it, and _leave_bin() was setting it to NULL before calling g_clear_object() so it was leaked. https://bugzilla.gnome.org/show_bug.cgi?id=766612