After 9d6e56db the syntax-check was unhappy due to wrong whitespacing:

  src/qemu/qemu_command.c:1637: for ( ; a.slot < QEMU_PCI_ADDRESS_SLOT_LAST; a.slot++) {
  maint.mk: incorrect whitespace around brackets, see HACKING for rules
  make: *** [bracket-spacing-check] Error 1