[clang-format] Fix lines=all case in clang-format.py

git-svn-id: svn://svn.chromium.org/llvm-project/cfe/trunk/tools/clang-format@312536 0b72dbe1-c17f-4bc7-b9db-2b4152be0356
diff --git a/clang-format.py b/clang-format.py
index 187125e..5fe592a 100644
--- a/clang-format.py
+++ b/clang-format.py
@@ -92,7 +92,7 @@
 
   # Call formatter.
   command = [binary, '-style', style, '-cursor', str(cursor)]
-  if lines != 'all':
+  if lines != ['-lines', 'all']:
     command += lines
   if fallback_style:
     command.extend(['-fallback-style', fallback_style])