* elfcode.h (prep_headers, swap_out_syms): Check for NULL return

	* elfcode.h (prep_headers, swap_out_syms): Check for NULL return
	from bfd_new_strtab.
	(elf_compute_section_file_positions): Check for false return from
	swap_out_syms.

	* linker.c (default_indirect_link_order): Check for NULL return
	from bfd_get_relocated_section_contents.

	* syms.c: Make example application in doc call xmalloc, not
	bfd_xmalloc.

	* aoutx.h (NAME(aout,slurp_symbol_table),
	aout_link_get_symbols, NAME(aout,link_hash_table_create)):
	* bout.c (b_out_slurp_reloc_table, b_out_squirt_out_relocs):
	* ecoff.c (ecoff_bfd_link_hash_table_create):
	* ecofflink.c (bfd_ecoff_debug_init):
	* format.c (bfd_check_format_matches):
	* linker.c (_bfd_generic_link_hash_table_create):
	(_bfd_generic_final_link):
	* reloc16.c (bfd_coff_reloc16_relax_section):
	(bfd_coff_reloc16_get_relocated_section_contents):
	* elf32-hppa.c (hppa_elf_build_arg_reloc_stub):
	* elf32-mips.c (mips_elf_final_link):
	* elfcode.h (bfd_new_strtab):
	(bfd_add_2_to_strtab):
	(elf_slurp_symbol_table):
	(elf_corefile_note):
	* libbfd.c (bfd_zmalloc):
	Use malloc and check the result, instead of bfd_xmalloc.