python: futurize -f libfuturize.fixes.fix_next_call

Change obj.next() calls to next(obj).

This is necessary for Python 3 compatibility.

Done using:

  $ py=$( (g grep -l -E '^#!.*python';find -name '*.py' -printf '%P\n';) | \
    sort -u | grep -v README.sh4)
  $ futurize -w -f libfuturize.fixes.fix_next_call $py

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20180608122952.2009-4-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
diff --git a/scripts/vmstate-static-checker.py b/scripts/vmstate-static-checker.py
index 60d1bf4..d346728 100755
--- a/scripts/vmstate-static-checker.py
+++ b/scripts/vmstate-static-checker.py
@@ -158,7 +158,7 @@
     while True:
         if advance_src:
             try:
-                s_item = s_iter.next()
+                s_item = next(s_iter)
             except StopIteration:
                 if s_iter_list == []:
                     break
@@ -173,7 +173,7 @@
 
         if advance_dest:
             try:
-                d_item = d_iter.next()
+                d_item = next(d_iter)
             except StopIteration:
                 if d_iter_list == []:
                     # We were not in a substruct