xend: pass-through: Use generic code in pci_opts_list_to_sxp()

Use dev_dict_to_sxp() inside pci_opts_list_to_sxp() now that it is
available.

Signed-off-by: Simon Horman <horms@verge.net.au>

tools/python/xen/util/pci.py

@@ -136,7 +136,7 @@ def split_pci_opts(opts):
                filter(lambda x: x != '', opts.split(',')))
 
 def pci_opts_list_to_sxp(list):
-    return ['dev'] + map(lambda x: ['opts', x], list)
+    return dev_dict_to_sxp({'opts': list})
 
 def pci_opts_list_from_sxp(dev):
     return map(lambda x: sxp.children(x)[0], sxp.children(dev, 'opts'))

tools/python/xen/xend/XendSXPDev.py

@@ -4,7 +4,6 @@
 
 import types
 
-# This includes a generic equivalent of pci_opts_list_to_sxp()
 def dev_dict_to_sxp(dev):
     def f((key, val)):
         if isinstance(val, types.ListType):