refine get_offline_msg_count
refine get_offline_msg_count

wcy123/erl_tool,zhuxiangkui/erl_tool,zhangchaoeasemob/erl_tool,zhangchaoeasemob/erl_tool,zhangchaoeasemob/erl_tool,wcy123/erl_tool,wcy123/erl_tool,zhuxiangkui/erl_tool,zhangchaoeasemob/erl_tool,zhuxiangkui/erl_tool,zhuxiangkui/erl_tool,wcy123/erl_tool,zhuxiangkui/erl_tool,wcy123/erl_tool,zhangchaoeasemob/erl_tool