fix coverity
fix coverity

noikiy/ShadowVPN,test1943/ShadowVPN,froggatt/ShadowVPN,noikiy/ShadowVPN,Spacecup/ShadowVPN,bjrara/ShadowVPN,froggatt/ShadowVPN,test1943/ShadowVPN,AI0day/ShadowVPN,AI0day/ShadowVPN,zhufenggood/ShadowVPN,xiaguangme/ShadowVPN,zhufenggood/ShadowVPN,li77leprince/ShadowVPN,nsdown/ShadowVPN,qskycolor/ShadowVPN,Spacecup/ShadowVPN,tdh62/ShadowVPN,tdh62/ShadowVPN,sunclx/ShadowVPN,nsdown/ShadowVPN,sunclx/ShadowVPN,bjrara/ShadowVPN,nsdown/ShadowVPN,li77leprince/ShadowVPN,xiaguangme/ShadowVPN,qskycolor/ShadowVPN