PR 33639 .debug_loclists output

The fuzzed testcase in this PR prints an almost endless table of
offsets, due to a bogus offset count.  Limit that count, and the total
length too.

	PR 33639
	* dwarf.c (display_loclists_unit_header): Return error on
	length too small to read header.  Limit length to section
	size.  Limit offset count similarly.