* coff-arm.c (arm_emit_base_file_entry): Check fwrite return value.

	* coff-arm.c (arm_emit_base_file_entry): Check fwrite return value.
	Return status.  Adjust callers.
	* coff-mcore.c (mcore_emit_base_file_entry): Likewise.
	* coff-ppc.c (write_base_file_entry): New function.
	(coff_ppc_relocate_section): Use it.
	* elf32-arm.c (find_thumb_glue): Check asprintf return status.
	(find_arm_glue): Likewise.
	* vms-misc.c (_bfd_vms_output_flush): Check fwrite return value.