These are minor fixes for swsusp and S3 sleep.

 - #ifdef mess in acpi_save_state_mem() is simplified
 - better error handling in reserving bootmem
 - handle video bioses that play with segment registers
 - automagic support for S3 on toshiba notebook
 - don't try to sync() when pdflush is already stopped
 - reorder actions to make pdflush not complain