PR26388, objdump debug dump memory leaks

PR26388, objdump debug dump memory leaks

num_debug_info_entries is used not just as a count but also as a flag
(DEBUG_INFO_UNAVAILABLE) after some errors.  That means
num_debug_info_entries can't be used when cleaning up malloc'd info.

	PR 26388
	* dwarf.c (free_debug_memory): Free alloc_num_debug_info_entries
	of debug_information.  Correct test of max_loc_offsets and
	max_range_lists.
	* rddbg.c (read_debugging_info): Free dhandle on error.