Fix descriptor leak. Close #3848.
Fix descriptor leak. Close #3848.

GitHubMota/redis,nnog/redis,yossigo/redis,spinlock/redis,soveran/redis,soloestoy/redis,yossigo/redis,rogerchina/redis,GitHubMota/redis,pmem/redis,oranagra/redis,rogerchina/redis,nnog/redis,neomantra/redis,hgl888/redis,soloestoy/redis,pmem/redis,neomantra/redis,charsyam/redis,ctripcorp/redis,Sciumo/redis,soveran/redis,rogerchina/redis,kensou97/redis,oranagra/redis,Sciumo/redis,pmem/redis,charsyam/redis,oranagra/redis,GitHubMota/redis,antirez/redis,pmem/redis,PKRoma/redis,neomantra/redis,PKRoma/redis,neomantra/redis,rogerchina/redis,nnog/redis,oranagra/redis,soloestoy/redis,ctripcorp/redis,PKRoma/redis,antirez/redis,spinlock/redis,nnog/redis,kensou97/redis,PKRoma/redis,spinlock/redis,hgl888/redis,antirez/redis,kensou97/redis,ofirluzon/redis,spinlock/redis,Sciumo/redis,soloestoy/redis,neomantra/redis,ofirluzon/redis,PKRoma/redis,charsyam/redis,hgl888/redis,antirez/redis,soveran/redis,ctripcorp/redis,hgl888/redis,soloestoy/redis,yossigo/redis,GitHubMota/redis,oranagra/redis,yossigo/redis,yossigo/redis,ofirluzon/redis,charsyam/redis,kensou97/redis,ofirluzon/redis,ctripcorp/redis,ofirluzon/redis,soveran/redis,Sciumo/redis,charsyam/redis