Fix presubmit check for the case when cpplint fails.

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10124006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11384 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

tools/presubmit.py

@@ -114,12 +114,15 @@ def CppLintWorker(command):
     while True:
       out_line = process.stderr.readline()
       if out_line == '' and process.poll() != None:
+        if error_count == -1:
+          print "Failed to process %s" % command.pop()
+          return 1
         break
       m = LINT_OUTPUT_PATTERN.match(out_line)
       if m:
         out_lines += out_line
         error_count += 1
-    sys.stderr.write(out_lines)
+    sys.stdout.write(out_lines)
     return error_count
   except KeyboardInterrupt:
     process.kill()