Fixed spaces/indentation according to guide lines

Problem introduced by commit 87f0aa48.

Signed-off-by: Bernardo Dal Seno <bdalseno@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>

lib/hypervisor/hv_xen.py

@@ -737,7 +737,7 @@ class XenHvmHypervisor(XenHypervisor):
     # TODO: Add a check for the blockdev prefix (matching [a-z:] or similar).
     constants.HV_BLOCKDEV_PREFIX: hv_base.NO_CHECK,
     # Add PCI passthrough
-    constants.HV_PASSTHROUGH:  hv_base.NO_CHECK,
+    constants.HV_PASSTHROUGH: hv_base.NO_CHECK,
     constants.HV_REBOOT_BEHAVIOR:
       hv_base.ParamInSet(True, constants.REBOOT_BEHAVIORS),
     constants.HV_CPU_MASK: hv_base.OPT_MULTI_CPU_MASK_CHECK,
@@ -840,8 +840,8 @@ class XenHvmHypervisor(XenHypervisor):
     pci_pass_arr = []
     pci_pass = hvp[constants.HV_PASSTHROUGH]
     if pci_pass:
-        pci_pass_arr = pci_pass.split(";")
-        config.write("pci = %s\n" % pci_pass_arr)
+      pci_pass_arr = pci_pass.split(";")
+      config.write("pci = %s\n" % pci_pass_arr)
     config.write("on_poweroff = 'destroy'\n")
     if hvp[constants.HV_REBOOT_BEHAVIOR] == constants.INSTANCE_REBOOT_ALLOWED:
       config.write("on_reboot = 'restart'\n")