Free symtab_hdr.contents and a cache_size correction

symtab_hdr.contents looks to be malloc'd memory, except in one case.
Change that one case to also be malloc'd and free when we are done.

	* elf.c (swap_out_syms): bfd_malloc outbound_syms.
	(_bfd_elf_free_cached_info): Free symtab_hdr.contents.
	* elflink.c (init_reloc_cookie): Correct cache_size.  locsyms
	is an array of Elf_Internal_Sym.