[rpc] fix typo --rpc_max_message_size flag validator

This is a follow-up to ac75b9ed6fa66cce100a1493e18d7eb74f5e1dd7.

Change-Id: I639f0f71af42ced84b0c0ced3016fc5eaa8fe401
Reviewed-on: http://gerrit.cloudera.org:8080/19238
Tested-by: Alexey Serbin <alexey@apache.org>
Reviewed-by: Yifan Zhang <chinazhangyifan@163.com>
Reviewed-by: Yingchun Lai <acelyc1112009@gmail.com>
1 file changed