[dak/master] stop using deprecated methods from apt_pkg

[Ansgar Burchardt <ansgar@debian.org>]

One occurence of apt_pkg.TagFile's Step() method was missed in
52c35949e1e7948a29133ffc9b24897d66af23c1.
---
 dak/check_archive.py |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dak/check_archive.py b/dak/check_archive.py
index 5265cc5..6f16aec 100755
--- a/dak/check_archive.py
+++ b/dak/check_archive.py
@@ -433,7 +433,7 @@ def validate_packages(suite, component, architecture):
         sys.exit(result)
     packages = utils.open_file(temp_filename)
     Packages = apt_pkg.TagFile(packages)
-    while Packages.Step():
+    while Packages.step():
         filename = "%s/%s" % (Cnf["Dir::Root"], Packages.section.find('Filename'))
         if not os.path.exists(filename):
             print "W: %s missing." % (filename)
-- 
1.7.10.4