Free IO context if any in RDB loading code.
Free IO context if any in RDB loading code.

Thanks to @oranagra for spotting this bug.

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