Fixed retval bug in cros_login.py.

PRESUBMIT=passed
R=shenhan
DELTA=1  (0 added, 0 deleted, 1 changed)
OCL=57683-p2
RCL=57685-p2
RDATE=2012/01/05 16:57:06


P4 change: 42664133
diff --git a/v14/cros_login.py b/v14/cros_login.py
index bf95be7..79d8479 100755
--- a/v14/cros_login.py
+++ b/v14/cros_login.py
@@ -111,4 +111,4 @@
 
 if __name__ == '__main__':
   retval = Main(sys.argv)
-  return retval
+  sys.exit(retval)