[cairo] libsvg memory mis-management in patterns

[Keith Packard]

svg_pattern_init calls 

	_svg_element_create (&pattern->group_element...)

svg_pattern_init_copy does not, instead it calls only

	_svg_element_init_copy (pattern->group_element, other->group_element)

I think this is wrong -- it will use the same group_element for both
patterns.

svg_pattern_deinit calls only 

	_svg_element_deinit (pattern->group_element)

I think this is wrong -- it should call

	_svg_element_destroy (pattern->group_element)

to both clean up the group_element and free the memory allocated
in svg_pattern_init above.

Anyone have different opinions?

-keith

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