frame.c (start_fde_sort): Only allocate erratic array, if linear one was allocated.

	* frame.c (start_fde_sort): Only allocate erratic array, if
	linear one was allocated. Return allocated flag.
	(fde_insert): Only insert, if there's a valid array.
	(fde_end_sort): Split, sort and merge if linear and erratic
	arrays exist, else just sort linear one.
	(search_fdes): New function. Linear search through original fde
	structure.
	(frame_init): Permit multiple initializations. Cope with
	memory shortages.
	(find_fde): Fallback on linear search, if failed to sort array.
	(__deregister_frame_info): Only free sorted array, if we
	allocated it.

From-SVN: r30799