Ensure we always have some target space in GConverterOutputStream
Ensure we always have some target space in GConverterOutputStream

When the converter fills the whole buffer without reading all input,
we need to enlarge the buffer. Otherwise we get an assertion failure
for `outbuf_size > 0' in g_converter_convert.

https://bugzilla.gnome.org/show_bug.cgi?id=619945

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