openwrt15.05增加failsafe模块，WEB登陆提示错误

最近在新的路由器上移植openwrt15.05，发现增加failsafe模块后，web登陆提示如下错误：

/usr/lib/lua/luci/dispatcher.lua:433: Failed to execute function dispatcher target for entry '/'.
The called action terminated with an exception:
/usr/lib/lua/luci/dispatcher.lua:433: Failed to execute function dispatcher target for entry '/failsafe'.
The called action terminated with an exception:
/usr/lib/lua/luci/dispatcher.lua:433: Failed to execute call dispatcher target for entry '/failsafe/flashops'.
The called action terminated with an exception:
/usr/lib/lua/luci/controller/failsafe/failsafe.lua:91: attempt to index upvalue 'fp' (a nil value)
stack traceback:
    [C]: in function 'assert'
    /usr/lib/lua/luci/dispatcher.lua:433: in function 'dispatch'
    /usr/lib/lua/luci/dispatcher.lua:168: in function </usr/lib/lua/luci/dispatcher.lua:167>

打开/usr/lib/lua/luci/controller/failsafe/failsafe.lua文件，发现

local fp
        luci.http.setfilehandler(
                function(meta, chunk, eof)
                        if not fp then
                                if meta and meta.name == "image" then
                                        fp = io.open(image_tmp, "w")
                                end
                        end
                        if chunk then
                                fp:write(chunk)
                        end
                        if eof then
                                ***fp:close()***
                        end
                end
        )

此处的fp:cloase()报错,于是将此处的判断条件修改成：
if eof and fp then
然后测试OK，为了彻底修改，打开openwrt-15.05/openwrt/package/feeds/luci/luci-mod-failsafe/luasrc/controller/failsafe，将该文件中的if eof then判断条件修改成if eof and fp then，即可。