Return 0 when roll scripts terminate gracefully.

BUG=408523
LOG=n
TBR=jarin@chromium.org

Review URL: https://codereview.chromium.org/536403002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23680 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

tools/push-to-trunk/common_includes.py

@@ -656,7 +656,7 @@ class ScriptsBase(object):
                             options, self._side_effect_handler))
     for step in steps[options.step:]:
       if step.Run():
-        return 1
+        return 0
     return 0
 
   def Run(self, args=None):