[RFA] bug fixes for varobj.c

[Martin M. Hunt]

Anything using varobj is randomly corrupting memory and will cause crashes in 
Insight or anything using mi varobjs.  This patch fixes that and some other 
minor problems.

-- 
Martin Hunt
GDB Engineer
Red Hat, Inc.

2002-06-10  Martin M. Hunt  <hunt@redhat.com>

	* varobj.c (struct varobj_root): Change frame from CORE_ADDR to 
	struct frame_id. 
	(varobj_create): Store frame_id for root.
	(varobj_gen_name): Use xasprintf.
	(varobj_update): Save and restore frame using get_frame_id() and
	frame_find_by_id().
	(create_child): Use xasprintf.
	(new_root_variable): Initialize frame_id.
	(c_name_of_child): Use xasprintf. Call find_frame_by_id().
	(c_value_of_variable): Use xasprintf. Move mem_fileopen call
	to prevent memory leak.
	

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