qemu: Only build devstr when needs (attach PCI controller)
qemu: Only build devstr when needs (attach PCI controller)

- qemudDomainAttachPciControllerDevice: Don't build "devstr"
  if "-device" of qemu is not available, as "devstr" will only
  be used by "qemuMonitorAddDevice", which depends on "-device"
  argument of qemu is supported.

- "qemudDomainSaveImageOpen": Fix indent problem.

* src/qemu/qemu_driver.c

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