* varobj.c (varobj_update): Change first parameter to

	* varobj.c (varobj_update): Change first parameter to
	pointer to struct varobj*. This function can delete
	varobjs, so we need to give callers the new varobj
	when this happens.
	(value_of_root): Update "var", too, if "var_handle"
	changes.
	* varobj.h (varobj_update): Likewise.