Fix bug in cat_file_to_cmd

From: Steven Howard <showard@google.com>



git-svn-id: http://test.kernel.org/svn/autotest/trunk@756 592f7852-d20e-0410-864c-8624ca9c26a4
diff --git a/client/bin/autotest_utils.py b/client/bin/autotest_utils.py
index 84d8b4c..bedd583 100755
--- a/client/bin/autotest_utils.py
+++ b/client/bin/autotest_utils.py
@@ -32,7 +32,7 @@
 	zcat or bzcat if appropriate
 	"""
 	if not os.path.isfile(file):
-		raise NameError, 'invalid file %s to cat to command %s' % file, command
+		raise NameError, 'invalid file %s to cat to command %s' % (file, command)
 	if file.endswith('.bz2'):
 		return system('bzcat ' + file + ' | ' + command, ignorestatus)
 	elif (file.endswith('.gz') or file.endswith('.tgz')):