svg_view: pattern leak fix.
svg_view: pattern leak fix.

gjtorikian/lasem,wavewave/lasem,gjtorikian/lasem,janmarthedal/mathml2svg,janmarthedal/mathml2svg,wavewave/lasem,gjtorikian/lasem,wavewave/lasem,gjtorikian/lasem,janmarthedal/mathml2svg,wavewave/lasem,janmarthedal/mathml2svg